4 Wire To 5 Wire Trailer Wiring. The one difference is the additional wire. The following trailer wiring diagram(s) and explanations are a cross between an electrical schematic and wiring on a trailer.
Our trailer wiring diagram is a colour coded guide designed to help you wire your trailer plug or socket.
The fifth wire for these units is blue and is typically used to control things like hydraulic disc brakes or additional auxiliary outlets.
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The metal-to-metal contact in the hitch is not. It is easier than you think. Connecting the wrong color wires will result in mismatched taillight functions and confusion on the road.