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Where Does Blue Wire of 7-Way Usually Run When Installing on Vehicle  

Published 08/28/2018

Question:

If I was wiring a 7 pin trailer harness to my car myself, what do wire the blue to in my vehicle. Thanks

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Expert Reply:

The blue wire of a 7-way runs to the blue wire of a brake controller to activate the trailer's brakes. If you don't have a brake controller or a need for trailer brakes you'd simply not use that circuit. I attached a diagram that has the standard functions of a 7-way listed.

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Jameson C
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