Shipping Weight: 3 pounds
Connect your towed car's lighting system to your RV to activate the signal lights required for towing. This custom harness wires in to your existing wiring with the included connectors. Operates as combined lighting system.
Typically, wiring your car for flat towing is a tremendous chore. You have to position and mount multiple diodes beneath your car and then splice into the car's wiring. Each wire - for running lights, brake lights, and both turn signal lights - must be connected to a diode. And don't forget to jump the diodes so that the running light signal is sent to both sides of your car.
Or...you could just use the TrailerMate wiring harness. This custom-designed system connects to your GMC Envoy's existing wiring. Each wire on the TrailerMate is labeled for trouble-free installation. Simply splice into your factory wiring and connect the labeled wires to your factory wiring with the included butt connectors.
After connecting the wiring harness, use the included bracket to mount the 4-way flat connector at the front of your towed car. Then hook up to your RV with the supplied wiring extension, and you're good to tow. Note: The extension included with this system requires that your RV have a 4-wire flat trailer connector. If your RV has a 7-pole round connector, or another type of connector, then an adapter is required.
Your GMC Envoy ordinarily operates on a three-wire system, wherein the brake signal and the turn signals travel along different wires to illuminate different lights. This is referred to as a "separate lighting system." When you hook up for flat towing using the TrailerMate harness, however, your towed car's lighting system will operate in a combined fashion. This means that the brake and turn signals sent by your RV to your towed car will be carried on a single wire. As a result, your car's brake lights will do the flashing for the turn signals. Your GMC Envoy will still function as designed - with separate lighting - when not hooked up to your RV.
Because this harness wires your GMC Envoy as a combined system, a brake light relay (RM-88400 - sold separately) may be required if you use a supplemental braking system with your towing setup. A supplemental braking system depresses the brake pedal in your towed car every time you apply the brakes in your RV. So, if your towed car's brake lights illuminate when the brake pedal is pressed and the engine is off - as is the case when towing - then you need to install a relay to ensure that the lights on your towed car always act in accordance with the signals sent by your RV via the wiring harness. Without a relay, the brake signal from your towed car will override the turn signal sent by your RV when you slow down to make turns, creating a potential hazard.
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