Troubleshooting No Power On Brake Controller Output Circuit at 7-Way But Power Behind Controller

Question:

I have reviewed three posts that you have about the blue wire, thanks for those. My issue is that I dont have no power on the vehicle side of the blue, but perhaps I am not supposed to? I have power from my blue wire coming from my brake controller, but if I test just the blue wire coming from the vehicle i dont get a reading on a power probe. I thought this was my issue but not think it is not as the power comes from the brake controller into the vehicle on the blue wire. If I am correct about that is there any thing else that could lead to a NC on my brake controller. I have followed all directions and I have power from the red lines that you connect to the posts in the fuse box under the hood. The vehicle 7 post receptor looks to be in good condition and when I hooked the same trailer up to a different vehicle with the same brake controller, it works fine, so I am at a loss for what could be the reason for it not connecting. Thanks

asked by: Cqfarm

Expert Reply:

If you have power on the blue wire of your brake controller but none at the back of the 7-way that would mean somewhere between the two places you checked there's a break in the circuit that's preventing it from making it to the trailer wiring connector pin. Most of the time this is because of dirt on the pins of the 7-way which can be just sanded off easily or it's broken wire between the two areas that would require you to trace the circuit back to find and fix.

I attached a help article on brake controller troubleshooting for you to check out as well.

expert reply by: Jameson C