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The compass idea is great! I wish I had thought of it. Check the grounding wires on the magnets. Pulling the wheels is the best alternative you have. You can also check the resistance of the magnets. Disconnect the power wire from one at a time and check with an ohm meter. Check the wire from the magnet that connects to power and the other meter lead to ground. The magnets should read about the same at all four wheels. Good luck!
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