How to Determine the Tail Light Wire Functions on a Vehicle

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Question:

how can i understand wires in cars and their functions

asked by: Kiyingi K

0

Expert Reply:

The only way to know for sure what a wire does on a vehicle is to test it with a circuit tester such as # PTW2993. This is because there is no standard for wire color and function and vehicle manufacturers use whatever color they have on hand. Testing the wires is the only way to know their functions. I have linked a video showing how the tester works.

expert reply by: Michael H

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Answer 1

You can absolutely flat tow a 2008 Smart ForTwo. I recommend starting with the Roadmaster EZ Base Plate Kit - Removable Arms #52285-1 and then using the Roadmaster Falcon 2 Tow Bar #RM-520. Then I recommend the Roadmaster safety cables #RM-643. You…

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Answer 2

The MORryde Manual Storage Reel #MR47RR has a lot of parts that are involved in the handle assembly. I have added a picture to help see the order. First onto the machined drum piece you will slide 2 white plastic washers. Then there are 3 wave…

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Answer 3

If your trailer has separate turn signals from the brake lights and you want them to remain that way, you will need to use a special converter. On the trailer side, behind the 7-Way, you will attach the Vehicle to Vehicle Taillight Converter,…

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Answer 4

Since your trailer uses a combined wiring system where the stop and turn signals run on the same circuit, in order to add a third brake light to your trailer you would need to use a 2-Wire to 3-Wire Converter, like part #118158. This will convert the…

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Answer 5

Hey Ron! For your 2025 Ford Maverick I recommend going with the Roadmaster InvisiBrake Flat Tow Brake System #RM-8700 with the Roadmaster Stop Light Switch Kit #RM87GR and the Roadmaster Brake-Lite Relay Kit for Towed Vehicles #RM-88400. For wiring,…

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Answer 6

Hey Randy, congrats on the new Bronco. You're definitely going to need to jump up to a heavy rated tow bar. Like you said the Roadmaster Falcon 2 item #RM-520 tops out at 6,000 lbs and your Bronco's already over that sitting there empty. I…

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Answer 7

The Roadmaster Direct-Connect Base Plate Kit part #RM-524459-5 is a great option for a 2020 Ford Ranger (All Models) and what I recommend using. If you don't already have a tow bar, it will pair perfectly with the Roadmaster Nighthawk All…

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Answer 8

Hey Jon, This issue does not happen in every vehicle, but in some it does. Basically the vehicle is overriding the motorhomes signals. To fix this issue a brake light relay switch is needed to be installed. The brake system #RVI44FR and the wiring…

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Answer 9

Trailers use what is called a 2-wire system which means the turn signals and brake lights are on the same circuit. When you try to add separate amber turn signals you will need to separate out the brake light signal using a converter, #118158. On…

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Answer 10

Testing lights on your trailer will require a 12V power source so if you are not going to plug in a connector like #H20046 you will need a separate 12V battery. Then use the negative post of the battery to attach your ground wire to and then and use…

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How to Determine the Tail Light Wire Functions on a Vehicle

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