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if your battery ground on the other end of the cable
where it bolts to the car's frame has gotten loose
the cars alternator cannot charge the battery.
then when it is running:
it's running strictly off the battery
until it runs out of charge....
if you REV the engine the lights should go brighter
if the alternator is working and the battery's low
if your alternator isn't charging well because of a loose ground
your head lights will appear colored yellowish or dim
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