Trailer wiring adapters the t one connectors and hardwire kits all use a 4 pole trailer connector. 5wireto4wire trailer ptcruiser vehicleconverter hopkins 48895 4flat independentrearlights towingadapter. 6 pin trailer wiring introduces two new functions a wire for connecting trailer brakes and a wire for 12 volt auxiliary power. Truck trailer wiring. For trucks remove twoRead More