Quote:
Originally Posted by piemma
BINGO! I bet one or both are dropping voltage.
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x2. definitely where to start. go check each battery volts now. After running all day, they should be at 13 or so. disconnect terminals before testing. If good, put grounds on and hook up one wire at a time until you see a drop or you can pull an amp test wire by wire. Maybe you have a short to ground or a bad electric motor (pump, blower, etc) draining juice. If bats are good and no drain, its likely that your wire to the radio is corroded mid wire, maybe a knick in insulation somewhere that gets wet and salty. check volts at bat and then at radio using same ground source (- battery lug) if you get the same reading, reverse the test and test from positive battery lug to the ground wire at the radio to see which one is corroded.
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