I don't know about your mustang, but mine when I turn it to ACC, the heater fan comes on too, and that can run down a batt really fast. Trust Me. Also an old batt is no good either, thats what it sounds like.
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'84 mustang GT turbo
'85 LTD
'89 Camaro Irocz z28
'94 Lightning
'96 Trans am
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