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Recommended Female Semi-Trailer Connector  


Several years ago I built a trailer light and brake tester for my RV. It is a full function unit, using all 7 flat pins. I also use it on our cargo and car trailers. I have a friend who wants to use it on semi-trailers. I have considered selling them. What I need is the right cable end to go into a conventional semi-trailer. I am an experienced automotive electrician. If you guys sell these plugs, please point me in the right direction. Any help would be most appreciated.


Helpful Expert Reply:

Sounds like you are looking for the trailer end plug for your tester that will fit into semi-trailers.

Most commercial trailers will use a 7-way heavy-duty pin setup like # PK11720. The female matching connector for this is the # PK11700 you were looking at. To wire this up to your tester I recommend a length of jacketed 7-wire # DW04914-1, this is sold per foot.

You will also want to verify the pin functions of the trailer, many of the semi trailers are wired with separate wiring, I have linked the wiring diagram to this page for your convenience.

I have linked all the above mentioned products as well as a wiring diagram to this page for your convenience.

expert reply by:
Jackie C
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