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Will Supplemental Braking System and Tow Bar Wiring from Motorhome Overload Brake Lights on Enclave

Question:

will be towing 2008 Buick Enclave behind MH, looking at wiring brake and tail lights with your diode kit, RM-154 question I have is the tow bar I have is Ready Brute with brake system, so when I put brakes on the MH it will pull the Buick brake - even with the diode wont I get a problem with the MH and buick brake power going through the diode when using turn signal? Not sure if the turn signal is the same buld as Brake bulb

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Expert Reply:

You may need a brake light relay # RM-88400 to keep the Buick Enclave brake signal from overriding the turn signal sent by your motorhome. The relay is needed on towed cars with combined lighting if you are using a supplemental braking system. Combined lighting means the vehicle has turn signals and brake lights on the same circuit.

To determine if a brake light relay is needed to properly wire your vehicle to be towed, answer the following questions.

Are you using a supplemental braking system that depresses the brake pedal in your towed car?
No - You do not need a brake light relay.
Yes - You may need a brake light relay. Continue on to the next question.

Do the brake lights on your towed car illuminate while the engine is off?
No - You do not need a brake light relay.
Yes - You may need a brake light relay. Continue on to the next question.

Do your towed car's brake lights act as both the brake signals and the turn signals?
No - You may need a brake light relay. Continue on to the next question.
Yes - Your towed car has a combined lighting system. You will need a brake light relay to ensure proper activation of its signal lights.

Does your towed car have separate brake lights and turn signals?
No - Your towed car has a combined lighting system. You will need a brake light relay.
Yes - Your towed car has a separate lighting system. You may need a brake light relay. Continue on to the next question.

Are you wiring your vehicle with a six-diode kit or a TowDaddy custom wiring harness?
No - You will need a brake light relay to ensure proper activation of your towed car's signal lights.
Yes - You do not need a brake light relay.

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