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Brake controllers apply voltage to the trailer brakes based on factors other than GAIN. They have to sense the truck is decelerating before they apply any braking so standing still they probably apply very little voltage to the trailer brakes (as you found out).
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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