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Consider cleaning ground connections as a preventative maintenance. In modern vehicles the number of issues that can occur due to bad grounds is infinite. Find a good source of ground locations specific to your car.
Clean all contact points to bare metal, including the chassis of the vehicle. You can not be to meticulous. Coat every surface with grease or your preferred water repellent. Even clean the washers.
To diagnose bad grounds,start at the negative battery terminal. Set your volt meter to 12 volts. With the suspect component operating under load, see if there is any voltage between the various connections in the ground circuit. I suspect virtually any voltage reading above 1/10th volt. Obviously a reading of 12volts (higher due to charging system operation) indicates a totally failed ground.
The most simple bad ground is a corroded light bulb socket or a loose-corroded battery terminal.
regards
mech
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