How To Wire In The Hopkins 7-Way Molded Trailer Wire Connector

Updated 06/03/2023 | Published 06/01/2023

Products Featured in This Question

Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS

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$15.61

Hook Probe Circuit Tester

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$14.36

Question:

Please provide a color coding diagram to connect a Hopkins H20044 wiring harness to a 2008 PJ Car Hauler trailer. Thank you.

asked by: Bernard

Expert Reply:

I've attached a wiring diagram for the 7-Way Molded Trailer Wire Connector # H20044, however there is no guide available to tell us the wire color functions on the trailer so you'll have to test each wire in order to determine its function. If your current plug is still functioning then I recommend connecting to your vehicle and going through each function and testing the wires for power with a circuit tester # PTW2993 at the junction box of the trailer. Having replaced quite a few 7-pole connectors I can say that this does take a bit of time to accomplish if you don't have a second person available to activate the functions in the vehicle for you.

If your plug is completely trashed then you can just use a standard 12v battery and put power to the wires individually and see which lights activate to determine their function.

If your junction box is just a standard metal junction box like you'd see in a residential setting then you can swap over to one like part # 3375601101 to separate and organize your wires to make replacement of the 7-way cable much easier.

expert reply by: Kevin C