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Vehicle Wiring Exceptions

The towed vehicle’s brake lights only illuminate with the ignition key turned to the “on” position.
Symptom — supplemental braking systems (such as Even Brake and BrakeMaster) must operate with the towed vehicle’s ignition key turned to the “tow” position. However, some vehicle’s brake lights only function with the key turned to the “on” position.
Solution — install a two-prong stop light switch and 10-amp fuse.

Ford Windstar 1999-2003, Ford Freestar 2004 and newer
Symptom — the Windstar and Freestar switch power on and off through the brake, turn signal and running light ground wire. Since the power circuit remains open, it will override a towed vehicle wiring system connected directly to the brake and turn signal wiring.
Solution — bypass the towed vehicle’s wiring with a Taillight Wiring Kit or a Magnetic Wiring Kit.

Jeep Cherokee and Grand Cherokee, 1999 and newer
Symptom — the taillight circuit is a direct short to ground when the ignition is turned to the “tow” position. If two additional diodes are not installed in the taillight circuit, as part of the towed vehicle wiring system, the taillight fuse in the motorhome will blow when the taillights are activated.
Solution — the Universal Wiring Kit contains two additional diodes expressly for the taillight circuit. ROADMASTER recommends attaching diodes to the taillight circuit for all Universal Wiring Kit installations, regardless of the make or model of the towed vehicle.

Vehicles with daytime running lights
Symptom — towing a vehicle equipped with daytime running lights (“automatic headlights,” etc.) can cause the circuit board which provides current to these lights to fail.
Solution — install two additional diodes in the taillight circuit. This will prevent the electrical interaction which causes circuit board failure. The Universal Wiring Kit contains two additional diodes expressly for the taillight circuit. ROADMASTER recommends attaching diodes to the taillight circuit for all Universal Wiring Kit installations, regardless of the make or model of the towed vehicle

 

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