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pull the 75 amp alt fuse which take the alternator out of the circuit. this will tell you if you have an alternator problem.
you really need a multimeter to test resistance. you can get a good one for 20 bucks. the needle ones are no good. you want digital.
it could be a loose solder connection right in the relay box.
wiggling wires to try to trigger the short is always worthwhile
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