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Message: <blockquote data-quote="MeanGrn Gt" data-source="post: 1089445" data-attributes="member: 8422"><p>low voltage at the battery doesnt mean a bad battery also can be the alternator which will drain the battery. it should be 13+ with it running at the battery if the alternator is good. one thing i would check is while having the voltmeter hooked up checking the voltage while running is tapping the alternator with something. ran into this issue with a friends f150 a month ago. gauge was reading low and batt light popped on. by the time i got to my house with tools all of a sudden pulling in the voltage shot up and light popped off and checked it with a meter and it was good so thought it was just a fluke. so continued moving my shit with the truck to end up getting stranded by a dead batt. got it to autozone pulled the alt they checked it said it was fine. put it back on and it was still acting up in the parking lot. gets pointed out by one of the employees that aint a dumbass(like the one that tested it) that by jarring it might have made it make contact again and work intermitently. well it was dark and snowing by the time i got it back on and 10 degrees and dropping so i just tapped it while she was in watching the gauge and when it was good got it home and swapped in a new one the next day. whenever would hit a bump or slow down or speed up that was enough to cause the alternator to work or stop working</p></blockquote><p></p>