ABS Trailer Brake Idiot Light... 2008 ProStar

[Waterloo]

(10-20-2016 )Dcolumbia Wrote:  If you are getting the light to light up at braking that usually means the only time it is getting power to the ABS controller on the trailer is when the brakes are applied. Usually the ABS fuse in the dash is bad or the ABS wire in the pigtail is bad. Make sure you have constant power when the truck key is on at the pigtail plug from the truck, no lights on, on at least one wire, the brake light power acts as a backup power wire to the ABS controller if the fuse or pigtail wire isn't making connection. My Volvo did this before, ABS light only works when the brakes were applied enough to trigger brake lights.

That is what I read about, the ABS wire having constant power at the pigtail. I wish I would have bookmarked that website that went into detail on this. I'll have to check that. Thanks DC, and everyone else that chimed in!