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To test for a bad ground I use a jumper lead with alligator clamps at each end and ground the device that way.
To find the actual problem you need to find the point where the wire actually is attached to ground and check the circuit there.
If the problem is not at the ground point It may be better just to run a new wire than fight with it.
Using a voltmeter, attach the leads between the negative battery post and the negative connection of accessory in question, then attempt to operate accessory. If the meter reads more than .5 volts, the ground is bad.
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