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How to Make a 7-Way to 6-Way Square Jayco Trailer Connector Adapter


I have a 2015 Ford Flex and a Jayco popup. I had previously purchased a pigtail online not from you, but the connections were not correct. Even after cutting and trying to reconfigure I could never get the running lights to go. Is this a similar situation and a solution to my problem? Thank you!


Expert Reply:

Yes, the Jayco trailers use a very unique wiring on their trailers. There is no adapter available that will go from a 7-Way vehicle side connector to a 6-Way square Jayco connector. You will need to make one using the follow parts:

7-Way trailer connector # H20042
6-Pole Square Trailer Wiring Connector Kit, # 37995

Start by identifying the wire functions of the trailer side connector so that it will be easier to wire in the 7-Way later. Connect the 7-Way wires on H20042 to the vehicle side connector in # 37995 based on function. On the H20042:

the white wire is ground,
the red wire is for left turn and brake,
the brown wire is for right turn and brake,
the green wires is for tail lights,
the blue wire is output from the brake controller (if applicable),
the black wire is 12 volt power,
and the yellow wire is an auxiliary circuit.

Do not attempt to wire only based on color because they will probably not match up. Go by function on how the trailers connector is wired.

expert reply by:
Jameson C

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