Modifying the M1102 trailer wiring for civilian use

The M1101 & M1102 are all wired for the standard military 12 PIN connector, but it’s an easy process to convert it to the civilian standard 7PIN or 4PIN connector. Here is how.

Most people don’t have and don’t need a military HMWWV to have fun or tow a nice military light trailer such as the M1101 or M1102. The good news is, you have the option to choose a 4 or 7 pin connection that will match up perfectly with your SUV or truck wiring. The cabling is routed directly to the terminal junction, located underneath the trailer. To start with, remove the clamps holding the vehicle harness in place, and disconnect from the junction.

You don’t have to, but some prefer, to cut the connectors off of the harness and reuse them with a 4 pin harness. The wires are identified with a metal tag crimped on the wire by the terminal end, with the wire number stamped into it.

Pinout to 4-pin trailer plug is as follows:

Green wire = Right turn/stop light = 22-460 (Pin J)
Yellow wire = Left turn/stop light = 22-461 (Pin B)
Brown wire = Tail/marker/running lights = 21 (Pin E)
White wire = Ground, ground on existing ground stud.

Pinout to 7-pin trailer is as follows:

Pin 6, Green wire = Right turn/stop light = 22-460 (Pin J)
Pin 5, Yellow wire = Left turn/stop light = 22-461 (Pin B)
Pin 3, Brown wire = Tail/marker/running lights = 21 (Pin E)
Pin 1, White wire = Ground, ground on existing ground stud.

Although there are seven (7) wires total, only 4 wires are necessary to use the standard trailer lighting system. Tuck the other cables away for future use or further modification as we’ll discuss in other posts.

If you need the wiring you might consider our Military Trailer to Civilian wiring hardness adapter kit.

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