You might try the compass trick, pull the break away switch and hold the compass near the wheel and see if it will pull the needle towards it.
As suggested, might have a broken ground somewhere thus no current through the magnets. That is assuming we are talking about standard electric brakes.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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