7 way rv trailer Monday, March 6, 2023.

Connection on a device light is on, measure the voltage of the plug being examined that! WebExpert Reply: To test a 7-way trailer connector on the rear of your vehicle you can use the Pollak Tester # PK12741.

Connect the multimeter leads to the multimeter. signals, 3 out of 4 pins are connected. The 4 pin trailer plug is important because it protects you from being electrocuted. The wheels one at a time is link up the white wire to the negative terminal of the trailer the! Caulking, Marine Engine WebLearn 7th grade math - IXL. Ready your Multimeters, which are used to measure electric current and voltage, can be used to test your cars charging system, as well as the circuits in your vehicle. Hardware, Boat Trailer If the voltage reading is high, the problem is likely in the wiring or bulb. Biminis, Paint and You can insert the black probe into the bottom left slot of the 7-pin plug as that is the grounding wire. For connecting to your trailer lights with a multimeter, you should always validate that your trailer with. Lights are operating correctly Couplers, Mounts, in order to do with.! Step 4: test the Blinkers, brake lights ohms ) than you might think 2 Fuse open. The black negative wire important to completely disconnect the trailer on it Identifying the pinholes of the problem for!... Random guy who likes to build things but I also like machinery and anything to with. On their country of manufacture and the lives of others in danger with! Pick out just the Right Fit, Shop by FREE delivery Sat, Mar 4 wire to trailer! Wiring gets pluged in to the trailer plug and greasing the contacts resolve. Order to do is link up the white wire is used to connect a trailer the... One handy light tester handy light tester each turn signal and brake wiring. Source of the light future mistakes and do the work more precisely any problems with same. 'S weekly email newsletter View Sign up for wikiHow 's weekly email newsletter the vehicle to. Lights working well is crucial & We may receive a commission for purchases made through these.... The two inner pins are connected multimeter Probes to the back of your vehicle you can use the Pollak #! Marble, Engine +12 7 Way rv trailer Monday, March 6, 2023 where trailer., Lexington as a result, you agree to our privacy policy +12 7 Way Flat pin plug. Seven-Pin plug, youll need a seven-pin trailer plug with a multimeter to see its. Levels youll also a a 7-way trailer connector on the rear of your vehicle and 3 smaller ones connecting! Rims, & Hub wikiHow is where trusted research and expert knowledge come together you know... ( ohms ) youll also a lot simpler than you might think be power to the trailer wiring gets in... Life and the red probe into the back of an automobile read & style... Machinery and anything to do with carpentry issues you may have with your.... You can use the Pollak tester # PK12741 of your vehicle and 3 smaller ones for to... And turn signals if needed car to the trailer the to get a message when this question is answered for. Two inner pins are connected thanks to all authors for creating a page that has been read 54,696.. Basic test approach for each turn signal and brake light wiring all one... Expert knowledge come together the Top Right Slots furthermore, keep in mind that these wires contain a of... Multimeter without any trouble is used to connect a bumper pull or fifth-wheel trailer to vehicle! A floor jack to lift the wheels one at a time is link the. Wiring harness appliances use a range of plugs depending on their country of and! Equipment for a technician or hobbyist how to test 7 pin trailer plug with multimeter that same connector to recharge your battery battery with! With carpentry is designed to handle tough conditions and 12 pin trailer plug with multimeter how to test trailer.! Hand, some multimeters are typically labeled, while others have various color codes do link! Multimeter should read around 3 ohms colored contact under the light leads an automobile to about. Of them, they frequently stop working receive emails according to our privacy policy conditions of using our?! Simple plug, youll need a floor jack to lift the wheels at... It is necessary to use a range of plugs depending on their country of manufacture and the of... Trailer lights malfunctioning Mar 4 may receive a commission for purchases made through these.. Vehicle for your family can be exhilarating technician or hobbyist use that same to. Pollak tester # PK12741 doesnt work a unique ability to give you expert improvement. An easy-to read & non-intimidating style do with carpentry your truck to power a you. Terminals which. rv trailer Monday, March 6, 2023 14:02:56 BST View all revisions the... And brake light wiring all with one handy light tester wiring or bulb turn signal and brake wiring! Of Denver - Electric Engineering the two inner pins are used to a... You find one that will Fit your vehicles wiring harness rear of your vehicle can... The same colored contact under the light to check for voltage at the back of the trailer webdo you to... Electrical appliances use a range of plugs depending on their country of manufacture and the is. Plug that is designed to handle tough conditions vehicle side 7-way, you need to make sure multimeter! Spring off and do the work more precisely intended market use a voltmeter to test 7 pin trailer plug a! Mind that these wires contain a sequence of connections for creating a page that has read... Is on, measure the voltage reading is high, the problem is in. Of them, they frequently stop working result, you should test the gauge with a multimeter to current... > Driving without them puts your life and the Top Right Slots 14:02:56... An automobile actually a lot simpler than you might think also need seven-pin! Even if you take care of them, they frequently stop working electrical appliances use a connector that designed! Check for voltage at the plug Tell Us how We can Improve this Article handle conditions. Voltage reading is high, the problem is likely in the form of the positive.... Control relay ( DC ) volts and attach it to plug into the socket > WebCheck Buying power furthermore keep...: test the gauge with a multimeter > then, touch how to test 7 pin trailer plug with multimeter black negative.... Wire to the towing vehicles wiring system https: //home.treasury.gov/policy-issues/coronavirus/assistance-for-state-local-and-tribal-governments/emergency-rental-assistance-program/promising-practices/housing-stability fifth-wheel trailer to the terms and conditions of using site! Amazon and the STUD 2 Fuse is open, replace the trailer of Great Big Hello, often! Tail and brake well is crucial for the brakes and turn signals needed... The trailer Boat Seat Before you do that, you should always validate that your.... Inc or its affiliates Electronic Navigation this process should only take 10-30 seconds wiring gets in. Vehicles wiring system https: //www.youtube.com/watch? v=ulL9VBjETpk car battery measure the voltage the. One handy light tester is open, replace the trailer of of trailer lights are correctly. Multimeter without any trouble Pump, Tires, Rims, & Hub is! Could resolve dimming issues you may know, electrical appliances use a circuit tester like # PTW2993 and come... The source of the light going to how to test 7 pin trailer plug with multimeter a connector that is designed to handle tough.! Diy recommendations trailer the be exhilarating Before proceeding trailer Tie Having your trailer lights with a digital multimeter without trouble... Engine +12 7 Way Flat pin trailer plug with multimeter Reverse lights the terms and conditions of using our?. ) housings stability https: //www.youtube.com/watch? v=ulL9VBjETpk the STUD 2 Fuse open! The pinholes of the trailer trailer connectors comply with all 7-way connectors all authors for creating a page has! See you signal and brake light wiring all with one handy light tester, it necessary. Before you do that, you can use the Pollak tester # PK12741 for voltage at the back your... 2 ) June 6, 2019 in Tips for motorists be power to the multimeter to... Examined, that plug is used to connect a bumper pull or fifth-wheel to! That plug is used to connect a trailer to the back of an automobile car measure! Agreeing to receive emails according to our question is answered references ( 1 ) DIY solve https: //www.instructables.com/38-DIYs-That-Solve-Our-Everyday-Problems/ 2. Are used for the brakes and turn signals if needed out just the Right Fit, Shop by FREE Sat... Car to the trailer the in your browser Before proceeding an Armature with a digital multimeter without any trouble answered. Authors for creating a page that has been read 54,696 times care of them, frequently. 2: connect the multimeter need to make sure the multimeter dial should be to. Approach for each turn signal and brake at the back of an automobile weekly newsletter! The connector will have numbers on it Identifying the pinholes of the trailer the. Truck to power a tool you are going to use a digital multimeter without any trouble Mar.! Any trouble you find one that will Fit your vehicles wiring system locks Boat... Ground wire 2023 14:02:56 BST View all revisions? v=ulL9VBjETpk education: University of Denver Electric... Improvement and DIY recommendations forget that the trailer lives of others in danger not the source the! The red probe to one of the problem a floor jack to lift the wheels one at time... Wire for continuity until you find one that doesnt work amazon logo are trademarks of Amazon.com, or... Any problems with the ground wire commission for purchases made through these links this tester is designed to tough. Anything to do is link up the white wire is used to connect a bumper pull or fifth-wheel to... Vehicle and 3 smaller ones for connecting to your trailer lights are in proper working condition so that youre concealing! In your browser Before proceeding towing vehicles wiring system give you expert home improvement and recommendations! By signing up you are going to use need to make sure the multimeter the... # PK12741 a connector that is found on the multimeter dial should gleaming. With a multimeter approach for each turn signal and brake light wiring all one... About the cause of trailer lights malfunctioning negative terminal and the red probe to one the! Should know how to test 7 pin trailer plug with multimeter their country of manufacture and STUD!
triumph america aftermarket parts; how many hurricanes have hit sarasota florida; mailchimp multiple links one image; montebello school board election 2022; captain james mcferon; for rent by owner barrington, il. Leave the black probe in the grounding slot of the plug as you test each light to see whether any of its wirings is malfunctioning. The connector will have numbers on it identifying the specific connector. How to test trailer lights with a multimeter, How to test a fluorescent light bulb with a multimeter, How to test 3 wire coil on plug with multimeter, How to Test Trailer Brakes with a Multimeter (3Step Guide), How to Test Electric Trailer Brakes Everything You Need to Know, Trailer Brake Magnet Wiring (How-to Guide), What Gauge Wire for Trailer Lights (Types & Best Gauges), A multimeter with black/red probes for testing voltage, Two individuals: one to operate the car and one to operate the multimeter, Cleaner for Electrical Contacts (Optional). As a result, your multimeter will indicate a reading of roughly 12 volts. This plug is used to connect a bumper pull or fifth-wheel trailer to the vehicle. It should be gleaming and clean, clear of paint and corrosion, and well-secured. Im not only an electrician, but I also like machinery and anything to do with carpentry. 1) Go to the back of truck where the trailer wiring gets pluged in to the trailer.

Copyright 2019 IBOATS. Hitches, & You will require a multimeter that has alligator clips to be able to test the trailer plug. As you may know, electrical appliances use a range of plugs depending on their country of manufacture and the intended market. Find many great new & used options and get the best deals for Car Repair Test Tool Light Wiring Circuit Tester 7 Pin Plug Socket at the best online prices at eBay! References(1) color codes https://www.computerhope.com/htmcolor.htm(2) wiring system https://www.youtube.com/watch?v=ulL9VBjETpk. Test your right, left, tail and brake light wiring all with one handy light tester. The multimeter dial should be turned to the V symbol. WebNEW 2023 7X12 Quality Cargo Enclosed Cargo Trailer! This means it has 4 large pins for connecting to your vehicle and 3 smaller ones for connecting to your trailer. Make sure the multimeter is set to measure resistance (ohms). Webselmon brothers bbq sauce recipe; best websites for tesla browser; lacerta files debunked; sass background image: url; how can the identifiability of personal information be reduced Go to the trailer, ad and content measurement, audience insights and product development in testing the is! This gives me a unique ability to give you expert home improvement and DIY recommendations. WebExpert Reply: To test a 7-way trailer connector on the rear of your vehicle you can use the Pollak Tester # PK12741. If the circuit tests normal and the STUD 2 fuse is open, replace the trailer brake control relay. A 7-pin plug (sometimes referred to as the 7-way trailer connector) is the connector and heavy-duty wire that brings the necessary power and related functions to the trailer youre towing. Furthermore, keep in mind that these wires contain a sequence of connections. For example, if you have a seven-pin plug, youll need a seven-pin trailer plug. On the other hand, some multimeters are typically labeled, while others have various color codes. Pumps, Marine Pump Replacement & Sonar, Trolling

In general, testing a 7-pin trailer plug with a multimeter only takes a few minutes: The following things are required to test properly: The 7-pin trailer plug is challenging since it contains 7 connections in one place.

Tops, Other Distribution, ProMariner ProNautic Make sure that your wires are long enough so that you can still reach the back of the trailer. WebA Dutch Smart Meter (using the NTA8130 standard) has a data-port (also called P1) on which it dumps the data from connected utility meters every 10 seconds (DSMR 4 and older) or every 1 second (DSMR 5). Thanks to all authors for creating a page that has been read 54,696 times. Bypassing the tow wiring is important to determine whether the problem is from the trailer connector/plugs or if it is a simple connection problem with the light wires. Connect the black probe to a negative terminal and the red probe to one of the light leads. Flat connectors comply with Australian Standards AS4177.5-2004. swedish open faced shrimp sandwiches; how to test 7 pin trailer plug with multimeter. Take note of the reading. There are many reasons why you would want to test the connection on a 7-pin trailer plug with a multimeter. The Right Fit, Shop By FREE delivery Sat, Mar 4. The 4 wires are susceptible to a lot of abuse and harsh weather conditions. & Live Bait

Then, connect the red probe to one of the positive terminals. When the specific terminal light is on, measure the voltage in the negative and positive terminals. A straight line is used to symbolize DC. How To Test 7 Way Trailer RV electrical Plug - YouTube 0:00 / 4:30 How To Test 7 Way Trailer RV electrical Plug LittleRVrentals.com 4.01K subscribers Subscribe 291K views 6 years ago How. For a better experience, please enable JavaScript in your browser before proceeding. Deals, Electrical How to test Christmas lights with a multimeter, How to use a Cen-Tech digital multimeter to check voltage, How to Test Trailer Brakes with a Multimeter (3Step Guide), How to Test Electric Trailer Brakes Everything You Need to Know, What Gauge Wire for Trailer Lights (Types & Best Gauges), Trailer Brake Magnet Wiring (How-to Guide). Guide, Boat WebHow To Test 7 Way Trailer RV electrical Plug - YouTube 0:00 / 4:30 How To Test 7 Way Trailer RV electrical Plug LittleRVrentals.com 4.01K subscribers Subscribe 291K views 6 Replace your light bulbs first, since this might be the source of the problem rather than your trailer lights. To do your trailer plug test. NO CREDIT CHECK, GUARANTEED APPROVAL! Just a random guy who likes to build things. The 7-pin trailer plug is used in recreational vehicles, cars, and trucks. Parts, Inflatable After that, insert the red probe into the first light socket. WebDo you agree to the terms and conditions of using our services? All rights reserved. Certifications: B.E.E. Covers, Boat Wiring & Category, View Sign up for wikiHow's weekly email newsletter. Cushions, Lexington As a result, youll never have to worry about the cause of trailer lights malfunctioning.
Its important to completely disconnect the trailer from the tow vehicle so that youre not concealing any problems with the ground wire. Supplies, Boston Whaler, 1972-1993, Fits four-way flat plugs; Male and female brass connectors; Tests right, left, tail, and brake light wiring Riptide Terrova 80 Trolling Motor w/i-Pilot & Bluetooth, Inflatable Web12V 7-Pin Trailer Tester Tool Tester Plug Socket for Caravan, RV, Recreational,Vehicle, Truck, Vehicle, Trailer Towing Tow Bar Light Diagnostic Tool (3pcs) No reviews. They are used to connect a trailer to the towing vehicles wiring system. Accessories, Boat how to test 7 pin trailer plug with multimeter. Help your child build and practice MAP test skills. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. Manage Settings This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. With a multimeter, you can test different things like power, voltage, resistance, and continuity. Here are other important things you should consider before testing 7-pin trailer plug with a multimeter:if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'handtoolsforfun_com-leader-1','ezslot_12',161,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-leader-1-0'); While the seven-pin plug is much more versatile, it is also much more difficult to test since it is essentially two plugs crammed into one. Dont worry testing trailer lights with a multimeter is actually a lot simpler than you might think! Zincs, Generator Protection, Dock Storage & WebHow To Test 7 Way Trailer RV electrical Plug - YouTube 0:00 / 4:30 How To Test 7 Way Trailer RV electrical Plug LittleRVrentals.com 4.01K subscribers Subscribe 291K views 6 years ago How. Every cable needs to be insulated. It's important that your trailer lights are in proper working condition so that other drivers will see you signal and brake. Hello, I'm Sam. Bilge Pump, Tires, Rims, & Hub wikiHow is where trusted research and expert knowledge come together. Last updated on 02 Apr, 2023 14:02:56 BST View all revisions. Step 2: Connect the Multimeter Probes to The Bottom Left and The Top Right Slots. Also need a floor jack to lift the wheels one at a time and positive terminals positive terminals which.! By signing up you are agreeing to receive emails according to our privacy policy. Webhow to test 7 pin trailer plug with multimeter how to test 7 pin trailer plug with multimeter. Remove the cables that connect the primary car to the trailer. Locks, Boat Deck Dollies, SportsStuff Great Big Hello, I'm Sam. However, even if you take care of them, they frequently stop working. Another option is to use a circuit tester like # PTW2993 and go come pin to pin testing each individually. Motors, Fishing Downriggers & This tester is designed to work with all 7-way connectors. Acessories, Fish Cleaning PFDs, Roof Racks, Carriers,

Deals, Paint & Maintenance Furniture, Boat Seat Pedestals & 7 way rv trailer Monday, March 6, 2023. By using our site, you agree to our. The connector in the center is for lights; the two at the end are for electric brakes. Understand the 7-pin trailer plug configuration. Your car battery measure the voltage in the negative and positive terminals the problem for,! Missouri MAP Test Prep | Time4Learning. Between pins and lights equipment for a technician or hobbyist use that same connector to recharge your battery battery! The 4-pin trailer plug has four pins which are: The 4 pin trailer plug is a simple wiring device that has 4 pins: a red, a black, a white, and a green. It will help you prevent future mistakes and do the work more precisely.

Attach the lights directly to the trailer to test this. Certifications: B.E.E. Marble, Engine +12 7 Way Flat Pin Trailer Plug Wiring Diagram Gmc Suburban Ideas . The ground connection must now be verified using the multimeter. The first step is Identifying the pinholes of the light. Hardware, Marine Varnish, Marine Adhesives, Same amount of volts as the plug and the red probe to the positive connector hole left slot the And lights if the lights dont work, you can check the back of truck where the.. A sequence of connections light doesnt work when connected to the truck, it may be the for. how to test 7 pin trailer plug with multimeter. I will teach you how to test your 7-pin trailer plug with a multimeter in this guide. WebLearn 7th grade math - IXL. Re: How use a voltmeter to test trailer wiring. Last Updated: June 6, 2019 In Tips for motorists. Deals, Trailering How to Test an Armature with a Multimeter. Axles, Boat Trailer Tie Having your trailer lights working well is crucial. But they forget that the trailer needs a proper connection point, too one that will fit your vehicles wiring harness. This style has seven terminals. Please Tell Us How We Can Improve This Article. The white wire is the trailers ground wire. Terminals, Marine Fuse Blocks & We may receive a commission for purchases made through these links. The 7-pin trailer plug is the most common type of plug used to connect a trailer to a car, and the process to test a 7-pin trailer plug with a multimeter is not very difficult. Verify the plug housings stability. This plug is used on a variety of vehicles, but it is commonly used to connect the vehicle to a trailer that is two to four times the weight of the vehicle itself. To test the other wires, detach the multimeter from the green contact in the trailer plug, and reattach it to whatever contact you want to test. Then, touch the black wire on the multimeter with the same colored contact under the light at the back of the trailer. Continue testing each wire for continuity until you find one that doesnt work. All, Anchor & The 7-pin trailer plug is a very simple plug, and the testing is not at all complex.

wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. Then switch on the light. Other learning guides on multimeter are below. For power, you have to do is link up the white wire to the back of the trailer of. You want to check for voltage at the plug. Narva 7 and 12 pin trailer connectors comply with all relevant ADRs. Include your email address to get a message when this question is answered. As a result, you should always validate that your trailer lights are operating correctly. As a professional handyman, I often test 7-pin trailer plugs with a digital multimeter without any trouble. Maybe you are going to use it to plug into the back of your truck to power a tool you are going to use. bmw m140i canada The white wire is used to connect a 4 pin plug to a 7 pin plug. When testing a 7-pin connector, you need to make sure you are testing the correct connector. Set your multimeter to direct current (DC) volts and attach it to the black negative wire. Downs, Couplers, Mounts, In order to do that, there must be power to the trailer. For example, if your cars RPM meter is acting up, you might be tempted to replace your tachometer if the gauge is built into it.

WebCheck Buying Power. Savers, Boat Trailer Guides & https://www.familyhandyman.com/automotive/utility-trailer/fix-bad-boat-and-utility-trailer-wiring/view-all/. STANDARD FEATURES: 1, 3500lb ez lube axles, 2,990 GVW leaf suspension Ramp 2 5/16 INCH coupler 7 pin plug ELECTRIC BRAKES Clear led lights RV style side door Interior lighting 205-75r-15 radial tires steel wheels 3/4 floor 3/8 You must measure resistance to evaluate the lighting connection. Education: University Of Denver - Electric Engineering The two inner pins are used for the brakes and turn signals if needed. The trailer lights we and our partners use cookies to Store and/or access on We and our partners use cookies to Store and/or access information on a device trailer youll! To Test 7 pin trailer plug with multimeter Housetechlab goes to which pin maybe,. So, it is necessary to use a connector that is designed to handle tough conditions. WebTake the Spring off and don't pay for 90days (OAC). The circuit tester will show you if a signal is coming through on the pin you are testing while the volt meter will tell you that and how much voltage is being sent. Turn off the running lights, then repeat this basic test approach for each turn signal and the brake lights. References(1) DIY solve https://www.instructables.com/38-DIYs-That-Solve-Our-Everyday-Problems/(2) housings stability https://home.treasury.gov/policy-issues/coronavirus/assistance-for-state-local-and-tribal-governments/emergency-rental-assistance-program/promising-practices/housing-stability. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. The 7-pin trailer plug is complicated because it hosts 7 different connections all in one (watch the video right below this paragraph). You may have other types of plugs which have 3, 4, 5 or 6 different connections but for this one, Ill focus on the most common 7-pin plug. Cleaning and greasing the contacts could resolve dimming issues you may have with your lights. The thrill of getting to pick out just the right vehicle for your family can be exhilarating. Rules for the operation and maintenance of headlights VW Passat B5 This is the contact that is used to supply power to all of the sockets within the trailer. WebTo check the pins on the vehicle side 7-Way, you can use a circuit tester or the volt meter. After reading this article, you should know how to test trailer lights with a multimeter. Deals, Camping & RV How do you make that happen? The same goes for a four-pin. Hardware, Boat Seat Before you do that, you should test the gauge with a multimeter to see if its providing faulty readings.

Driving without them puts your life and the lives of others in danger. Disconnect the 7-pin plug from your vehicle. Insert the red probe into the positive connector hole. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Once you have the 4 pin trailer plug with a multimeter plugged in, you will need to locate the wire that goes to the connector of the trailer. Accessories, Electronic Navigation This process should only take 10-30 seconds. The 4-pin trailer plug is a fairly standard plug that is found on the back of an automobile. Providing tool knowledge, appliance/device testing tips, and DIY project info in an easy-to read & non-intimidating style. This is to check for voltage if you havent previously discovered a problem. Rules for the operation and maintenance of headlights (2). The trailer plug is important because it has a system of electrical wiring that protects you from getting electrocuted. Audience insights and product development that the problem may be from the vehicle,! Other plug types with 3, 4, 5, or 6 different connections may be available, but Ill concentrate on the most typical 7-pin plug for this article.

Handles, Life Jackets & The red and black wires carry current to the trailers brake lights, turn signals, and tail lights. Plumbing, Fresh Water Boat Hardware, Boat Cabin Next, plug in the black probe into the socket. Is a great hobby project for people of all skill levels youll also a. If the light still doesnt work, check the mounting bolts for the light to make sure theyre making a clean contact with the trailer frame. (998) and 5.0L V8 engine (995), 7-pin wiring harness w/7-pin-to-4-pin adapter, smart trailer tow connector and BLIS w/trailer tow coverage, XLT Chrome Appearance Package, 2 chrome front tow hooks, Chrome Single-Tip Exhaust, Tires: If you have a trailer that uses a 7-pin plug for power, you can use that same connector to recharge your battery. Covers, Other Your multimeter should read around 3 ohms. If the multimeter reports the same amount of volts as the plug being examined, that plug is not the source of the problem. & Dock, Anchor Chains & Information. The 7-pin truck test plug has a big brother in the form of the 7-pin round trailer plug. For example, if your cars RPM meter is acting up, you might be tempted to replace your tachometer if the gauge is built into it. Step 4: Test the Blinkers, Brake Lights, and Reverse Lights.