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Converting a Trailer with 5 Round Connector to Car with 4-Way Flat Connector

Question:

I have a motorcycle trailer with a 5-wire round connector that I want to tow with my car that has a 4-wire flat connecter. What adaptors do I need to make all the light work properly on the trailer?

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Expert Reply:

Typically on a motorcycle that 5th function is just the brake light that is separated out from the turn signals. Since your car has the brake and turn signals combined (typical for a 4-Way Flat connector) you will need to install the Vehicle to Vehicle Tail Light Converter # 118158 which separates the brake and turn signals from your tow vehicle.

Start off by testing the 5-Way on your trailer and verifying that 2 pins are for the right and left turn signals, one pin is brake, one pin is running lights, and the last is ground. If that is the case then cut the 5-Way off (or splice in behind it) and proceed to install the converter.

Once the converter is installed you will need to install the Hopkins Endurance 4-Way Flat Trailer Connector # HM48110 (which includes a tester). Connect the green and yellow wires from the converter to the green and yellow wires on this 4-Way, then connect the brown wire from the 4-Way to the running light circuit on your motorcycle and ground the white wire. You can use the included quick splices but I prefer the Deka Heat Shrink Butt Connectors # DW05744-10 as they will do a much better job at protecting the wires from the elements.

expert reply by:
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Jon G

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