when truck is running and you stop the voltage drops down very low.
start up again and it picks up again to normal. when you first start
it, it's ok but when it warms up it drops when you stop. i have
replaced cables, cleaned ground, tested voltage at battery ok when you
speed it up.what else should i check? the alternator looks new, i think
it's beck arnely or something like that. otherwise the truck runs fine.
Without a voltmeter, it's just a guess. Normal system voltage is pretty
"tight", in the 13.5 to 14.5 volt range, depending on heat and state of
battery charge. It sound like your warm idle is too low, causing the
alternator to not be charging at low rpm.
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