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How to Replace a 4-Way Trailer Connector with 8 Wires  


Hello - I am replacing the lights on my Karavan Seadoo trailer. I cut the lamp assemblies off and I wanted to replace the f pinnflat connector as it got road burn. I noticed the kit I ordered comes with new wiring however I was planning on just splicing the tail lights in and connector. The four pin flat I cut off has seven wires and the one it came with has four. Am I able to connect all the whites and all the browns together to make the four wire work with the existing wiring on the trailer? Thank you for your help.


Expert Reply:

A 4-way trailer connector will have four functions which means it will also have four wires for the exception of wishbone harnesses. These four functions are ground, tail light, right turn, and left turn. The ground function will usually be represented with a white wire, the tail light function will usually be represented with a brown wire, the right turn signal will usually be represented with a green wire, and the left turn signal will usually be represented with a yellow wire.

From the looks of the photo you submitted, instead of all the like functions being spliced together and then run to the trailer connector using a single wire, they were all ran to the trailer connector separately. When installing the new lights on your trailer you will want to splice together all like functions and then run a single wire for each function to the trailer connector.

In order to slice the new wires together I recommend using the Deka Heat Shrink Butt Connector part # DW05743-10 as the heat shrink body will work to keep out moisture. I have attached our wiring help article for you as well.

expert reply by:
Conner L
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