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Message: [QUOTE="BSWIFT, post: 716247, member: 16802"] Trailer brake wiring is real straight forward. With the help of a friend, take a multimeter and set it to DC volts on a scale for 16 or more volts. Have your friend sit in your truck and work the controls, with the engine running. The center pin on the connector should be for charging a trailer battery and should have 12 volts or so. The bottom pin should be the brake, however, the left and right turn lamps also have a brake pin(common). Once you have the trailer BRAKE pin located you can start with the trailer. Use 12 AWG stranded wire, run from the appropriate pin to one brake on the trailer, either side is fine. Then take the wire to the other wheel on top of the axle. The trailer ground profides the rest of the electrical loop. Some wiring harnesses on pickups have tags on the wires right behind the plug. That is the easiest way to find it but not the fastest. [/QUOTE]