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Adapting 5 Pin Round Connector on a Trike to 4-Pole Flat Trailer Connector


My trike came with a round 5 pin connector. My trailer has a flat 4 pin connector. I have not been able to find an adapter anywhere. Any suggestions?


Helpful Expert Reply:

I have some options for you, however, I am not familiar with an adapter to convert a 5 pin round trailer connector to a 4-pole flat trailer connector. Since your trike has a 5 pin trailer connector, the extra wire on your 5 pin connector will serve one of two purposes. It is either the brake light signal or a constant 12-volt power feed to the trailer.

You can easily determine which case you are dealing with by using a circuit tester like part # 40376 on the plug. Activate the turn signals, running lights and brakes to determine which pin carries which circuit. If the extra pin carries a constant 12-volts, and your trailer does not require any power supply, you could simply construct an adapter using parts # PK11501 and # 18172.

If the extra pin carries the brake light circuit, then I recommend replacing the 5 pin round connector with a 4-pole flat trailer connector to match the trailer. For this, you will need a tail light converter like part # 119190KIT. Your trailer uses a combined wiring system, meaning the brake lights and turn signals are carried on the same wire. To install the tail light converter, you will simply remove your existing 5 pin connector, connect the brake light wire to the red wire, the left turn wire to the yellow wire, right turn to green, tail lights to brown and ground the white wire. The black wire will run to the positive battery post via the included fuse holder.

helpful expert reply by:
John H

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