MCL, I also believe you may have a wiring issue. I wired in a controller in my '99 Silverado last summer with an aftermarket pigtail to the box on the firewall. It worked fine, then my nephew with a 2003 Silverado borrowed my trailer. I offered him the controller and all instead of him buying that for just one camping trip. Thinking the whole works would swap out flawlessly was a mistake (the trailer brakes came on full when the running lights were turned on). We spent an hour noggin' scratching, tracing and retracing wire paths and schematics. By deduction we finally got it working. The required pigtail plug pin configuration for both trucks was the same but wired differently from there. If I rememer right there was an issue with where to hook a fine light blue wire.
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