The motorhome has separate brake and turn signal lights; the towed vehicle has combined brake and turn signal lights. Then you need this: the Brite-Lite wiring converter connects a vehicle with a separate brake and turn signal system to a vehicle with a combined brake and turn system, while delivering more current to the towed vehicles brake and turn signal lights for brighter illumination
Roadmaster 732 Brite-Lite Wiring Converter Brite-Lite Wiring Converter The Brite-Lite converts a 3 wire electrical system on a towing vehicle to a 2-wire system on the towed vehicle. Lab tests have shown Brite-Lite makes turn signals 65% brighter and brake lights 25% brighter than other brands. Brite-Lite can help prevent rear-end collisions in heavy traffic or under adverse conditions. Heavy-duty aluminum heat sink design effectively dissipates heat and outlasts other brands. Three wire systems use a separate wire to carry the brake signal. Two wire systems have the brake and turn signals sent along the same wire.
