grounds and connections in cars/trucks are subject to corrosion.
to stop corrosion, use a special grease called NO-OX-ID. it is made by sanchem, inc and you can get it on ebay.
It was invented by the army in WWII. It is a conductive grease that will not catch fire (but it can smolder a bit). It is very resistant to being washed away.
I use it on all my car battery/alternator connections, grounds, and single wire connections. do not use it on multi-wire connectors.
ALL puzzling shorts I used to have (i.e. above) have stopped.
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