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Do I Need a Brake Light Relay for Flat-Towing a 2022 Jeep Wrangler?

Question:

Is a brake light relay required when flat-towing my 2022 Jeep Wrangler?

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Expert Reply:

There are a few questions to consider in order to determine whether your 2022 Jeep Wrangler will require a brake light relay like part # RM-88400. I included this question tree to guide you through those 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.

From these questions, if you determined that you need a relay, I went ahead and attached an installation video to walk you through the process of the Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400.

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