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What are the Different Circuits on a 4-Way


Bought the Curt 4-way flat connector tester Code I26. Im sure its a wonderful product. But its not good for much if you dont already know what each LED is supposed to correspond to. Yes, I can tell if one lights up when the turn signal is on, etc. What I cant tell is if the wiring has been installed properly, or is something wrong, like right turn signal wire connected to left, etc. Can you tell me specifically which light is supposed to be right signal, which left, which tail lights? Thanks for your help!


Expert Reply:

The jacketed circuit is the ground. The one right next to that one is the tail light circuit, next to that one is the left turn circuit. And then the last one on the end is the right turn circuit.

Check out the picture I attached to see the circuits labeled.

I attached an FAQ article on trailer wiring that you might find informative also.

click to enlarge
expert reply by:
Jameson C

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