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14/10/2021 10:21 am
Topic starter
Morning I have a GMC 3500 HD Diesel with a trailer brake issue. I have replaced everything front to back, checked fuses and still have no brakes, I do have all my other functions (brakes turn signal lights). Hope you can help. Thanks
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14/10/2021 6:06 pm
Well all that stuff is computerized running off your car's wiring system. You can't touch those things unless you're heavy GM dealer level scan tool to do by directional test the only thing you could check for is shorts and the wire blown fuses or bad realize that's it. That's why many people don't buy diesels and those large trucks cuz they are electric nightmares as they age
