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1st check the ground on the male receptacle on the truck and the female on the cord. Any type of corrision can cause the system not to work. If corrosion is visible clean the post with sand paper or small file. DO NOT USE ANY SPRAY. If this does not remedy the problem then take off the wheels and brake drums and check the magnets and wires. While doing this also check the brakes, pack the wheel bearings and replace the grease seals if needed.
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