Factory brake controller

[Jaychevy81]

I have the factory brake controller I have a single axle big Tex trailer with brakes. Recently when I hook it up it says check trailer wiring. Then trailer disconnected then service trailer brake system. My question is I’m not sure if it’s truck or trailer side. This trailer has worked fine before I checked the obvious trailer ground both trailer plug and truck plug. Just wondering if the service message could mean truck side. When no trailer is connected nothing comes up when hitting the brake controller it seems like it’s fine. Any thoughts thanks.

 

 

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[catpartsman]

I had a very similar issue with my truck and factory brake controller. Ended up being a bad wire for the trailer brakes that ran through the axle tube. We fixed that and the issue seems to have went away. Might check the trailer brake wiring.


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