'96 Chevy K1500
Open dual-axle trailer - brakes on both axles
Draw-Tite Activator II brake controller

Works fine in the driveway, and early in a tow. After towing a while, the brake controller overloads when activated while moving, but not while stopped - strange.

Is this likely a defective controller, bad wiring, or something in the trailer brakes? How do I track it down?

Thanks,

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Marty Doane
ITS RX-7 #13
CenDiv WMR