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Determining Function of Blue Wire on Trailer 4-Way

Question:

4 way plug on 1992 Dodge Dakota has a blue wire what is that for. Pickup connector is a 4way has blue, brown, yelliw and green.

1

Helpful Expert Reply:

Normally blue isn't a color seen on 4-way trailer wiring, but based on the other colors you have it most likely is ground. Reason being brown is normally taillight, yellow is normally left turn/stop, and green is normally right turn/stop. Usually ground is white though.

helpful expert reply by:
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Jameson C

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