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if you take the top cap off you can get at all the wiring. For that matter i think if you just take the batteries out you can remove the switch and still check all the wiring. If i remember there are only 4 wires. 2 to the switch and 2 the motor. If you use a pair on needle nose you should be able to check the ones on the motor to make sure there tight. As for the switch just pop it out and check that the wires are tight.