'88 4Runner - Battery drains after new alternator installation!!
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'88 4Runner - Battery drains after new alternator installation!!
'88 4runner - installed a new alternator and have had to jump my truck every day - any ideas on what could be draining the battery? The battery is about 6 months old. Nothing else has been done, nothing else has been hooked up or left on overnight etc...
#2
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It may be a bad alt. You might charge the battery and unhook all the wires from the alt and let it set over night . If is dead in the mourning it is in the truck if not it is in the alt.
You will need to cover the wires at the alt to prevent any shorts. If it goes dead with the alt unhooked the battery could also be going bad .Most part stores can do a load test on it for free.
You will need to cover the wires at the alt to prevent any shorts. If it goes dead with the alt unhooked the battery could also be going bad .Most part stores can do a load test on it for free.
Last edited by swampfox; 01-12-2011 at 03:06 PM.
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yeah, it sure was annoying trying to get the old alt outta there. ended up having to take the bolts off the fan shroud to move it out of the way. it was still like some sort of impossible puzzle, twisting it and turning it until it was free...
thanks boys! gonna unplug it tonight and if the battery's still good tomorrow i'll get the alt tested...
thanks boys! gonna unplug it tonight and if the battery's still good tomorrow i'll get the alt tested...
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I'm certainly no expert but I would have the battery and alt tested. Chances are the alt is good but batt won't hold a charge. I am assuming that the battery ran down a few times before the alt was changed? That is what kills batteries from my experience. Good luck.
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By chance when you replaced the alternator was the battery brought up to full charge?? Before starting the truck.
At anytime since the change does your low charge light come on or if you have a voltmeter what does it read
You did remove the ground while changing things. These trucks had poor grounds from new that might be part of your problem.
This was a known problem on Fords the discharged battery would cause the alternator to have full output and fry the diodes .
Another the thing the wire coming off the B terminal of the alternator gets brittle with age and might have broke or got to the point it no longer conducts
If you want to work on these trucks a Multimeter is a must even a cheaper one will help you to test and know all kinds of things
Good luck
At anytime since the change does your low charge light come on or if you have a voltmeter what does it read
You did remove the ground while changing things. These trucks had poor grounds from new that might be part of your problem.
This was a known problem on Fords the discharged battery would cause the alternator to have full output and fry the diodes .
Another the thing the wire coming off the B terminal of the alternator gets brittle with age and might have broke or got to the point it no longer conducts
If you want to work on these trucks a Multimeter is a must even a cheaper one will help you to test and know all kinds of things
Good luck
Last edited by wyoming9; 01-13-2011 at 12:25 AM. Reason: typo
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