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Electric Brake Controler
We have a "Brake Force" controler on a 2004 Silverado 1500. The truck waas equiped with the Trailer Package, which meant it was pre-wired for the brake controler. Just plug in into the panel box under the dash.
When the controler was first installed, the green LED light (indicating power) would only come on when the brake was used, but the contoller worked fine. This summer, a power wire rubbed againt the trailer frame and shorted, blowing the electric brake fuse in the truck. Replaced the fuse, now the contrler green power light is on all the time, but the trailer brakes won't actuate from the brake pedal. If we use the manual overide slide switch, the brakes work.
We are puzzled. Anyone know why the trailer brakes won't engage when the brake pedal is pressed. They worked before the short and fuse replacement. Now they only work with the manual overide switch. We tried a different controler box. Same results.
Help if you can. Thanks
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Electric Brake Controler
Thanks Murf. Suspected a short, but we had already fixed the short to the brake actuator. If I understand your post, you are saying there is a short in the trailer wiring. The green controller light is on whether the trailer is plugged in or not. According to the "Brake Force" literature, the light is supposed to be on all the time. The odd part is that the green light was never on when the controler was working, now i'ts on all the time, and doesn't work.
Electrical problems are a real joy. There are no simple ones.
Thanks again.
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Electric Brake Controler
On all the time, trailer or not. But the "Brake Force" literature seems to indicate that that is the way it should be. Gives you stuff like "only draws 6 milliamps and would take 6 months to drain your battery"
When it was working, I could get the green light to "flash" just before the brake power indicating lights would start. It wasn't on all the time, trailer or not. When you pushed the brake pedal, it would flash green before the brake power indicating lights would start kicking in. Fixed the short at the brake actuator, changed the fuse in the truck brake controller circuit, now it's on all the time, trailer or not, but doesn't actuate the brakes automatically.
There is also a short circuit indicator light (red LED) on the controller. It indicated the short at the actuator. Since fixing the short, no red light indication.
Yikes..........
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Electric Brake Controler
Checked the level adjustment (which is the troubleshooting guide answer) and even changed it out for another controller, same results.
I'm beginning to think that the harness may not be compatable with the controller. There was a harness that came with the truck, but of course, didn't use it. Used the harness that came with the controller. I'm thinking that the circuit that us supposed to actuate the breaks (timing circuit) when the break light circuit is hot isn't hooked up properly.
The crazy thing is that this all worked fine when the green light wasn't on, before the short and the replaced fuse. The pedal actuated the trailer brakes when all that was happening.
What the..............?
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Thanks, never thought of a 2004 as an older truck. All the trailer harness wiring is factory. Never had a splice piece in it.
I will have them check the trailer. It's only three months old, but you know how trailers are put together. We heavility reinforced the trailer the day we brought it in. Could be something in the wiring on the trailer, but not a short that the contrller can detect.
Thanks again.
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Well at least I can bend over and slide the manual overide to get them to actuate. Just have to juggle the cup of coffee, cell phone, message pad, and oh ya, driving at the same time.
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