RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
Trailer Lamps: Description and Operation
Trailer Tow Wiring
In addition to the trailer tow wiring provisions, all vehicles include right and left trailer tow stop/turn relays installed in the PDC. When the FCM
receives the appropriate inputs for normal turn signal, hazard warning or brake lamp operation, it responds by also energizing or de-energizing these
trailer tow relays. When a trailer tow relay is energized, it provides battery voltage from a fused B(+) fuse to the trailer lamps through the trailer tow
wiring to synchronize the illumination and flash rate of the trailer brake and turn signal lamps with those of the tow vehicle.