5 Wire Trailer Harness. This is the easiest wiring you will ever have to do. I have done is simply spliced into the lines at a I am assuming you are testing this without a trailer hooked up.
With this wire harness, install break and turn lights and proceed with the comfort of knowing your trailer is safe and road friendly. I do not see their purpose. The one difference is the additional wire.
The fifth wire for these units is blue and is typically used to control things like hydraulic disc brakes or additional auxiliary outlets.
CURT trailer light kits come with everything you need to rewire your trailer and have it ready to hitch up to your vehicle.
All intermediary wires within the light colored harness seem to follow the same paths as before. The one difference is the additional wire. Wire Harness for Automotive Truck Trailer Assembly.
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