I have a 2008 chev 2500 duramax and are having trouble getting the itergrated brake controller to work consistently on my tri axle trailer. Solid ground and good wiring continuity. Some times they work and some times they dont. The Chev. garage says the integrated brake controll system wont work on a tri axle trailer. That doesnt sound right.
asked by: Justin A
Because the 2008 Chevrolet 2500 Duramax has an OEM integrated brake controller, I do not have any information on how many axles the controller can support. It sounds to me like the person at the garage may not be doing his research on their trailer brake control system, but it is possible that the factory system cannot support more than 4 brake assemblies or 2 axles with trailer brakes. If I were in your position, I would contact Chevrolet directly to try and get information about how many brake axles their controller will support.
If you determine that you need a controller that is capable of more brake axles, the OEM controller on the GM vehicles can be bypassed. We have an informational article detailing how to bypass the OEM controller and install an aftermarket brake control, see link. For your vehicle I would recommend the P3 Brake Controller, # 90195, which is capable of handling up to 4 axles with trailer brakes, and is very easy to use. This controller also has built in troubleshooting diagnostics to help locate problems.
Along with the controller you will also need a length of 12 gauge wire, # 12-1-1, long enough to go from the controller to the trailer connector, and an M8 Nut, # 185917, to connect the power wire for under dash brake controller wiring.
If you find that the factory controller will support 3 axles, I believe you will, then you will need to start troubleshooting the trailer brakes and magnets. I put together an article detailing how to check brake magnets, see link, and I have linked a video we did on checking and replacing the electric brake hub and drum assembly and brake magnet for you to review.
Another thing to check is the trailer connector and vehicle connector. Corrosion inside one or both connectors can span connections and cause intermittent or weak braking performance also.
It is imperative, for safety, that you get the trailer brakes working properly. Let me know what you come up with and we will figure out the issue, it may just take a bit of checking and testing.
expert reply by: Bob G
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