Question about 1997 GMC Safari

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Alterantor not charging

Alternator and battery are both new as is the srarter

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  • 33 Answers

How do you know the alt isn't charging?

Posted on Apr 22, 2014

Testimonial: "yes at 14.9 amps"

  • millstl Apr 22, 2014

    It should be volts, not amps. And 14.9 volts is actually a bit high for charging. Should be around 14 to 14.5 volts

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Make sure you test it at the alterantor..not just at the battery..Your battery is the 9 v..under a load..while car running..but you have a wire that should be running from your alternator to your battery...it mau be bad..Or if you have a external regulator, that could be the problem, but i doubt it for that vehicle...Check your harness for the alternator, and make sure you have that power wire running back to your battery from the alternator...

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New battery but still acts dead - Does computer need to be reset?


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1 the new battery may not have been charged from the store so would need to be charged before use, charge new battery on a charging set and see if this resoves the problem. *or use slave leads and start from a second vehicle)
2 your alternator may not be charging the battery so after a while it will just die. use a volt meter and check that volage is increaseing to your battery when the engine is running.
if not suspect alterantor defective and may need replacement.

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Alternator over charge the battery ,i have a tune up done on the van but no fire i put it on the machine result igin coil change it no better


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i hope this helps,
matthew

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1 Answer

Battery terminal gets extremely hot. just replaced alterantor and battery. battery indicator light also on.


Sounds like for one reason or another that alternator is putting out too much voltage to battery. Did mechanic check to see if new alternator was rated same or close to old one, as in amperage rating? Pulley on new alternator same size? You'll need to get it to another mechanic who knows what he's doing, obviously that guy wasn't too concerned with curing your problem. That's why I was hoping you had a voltage reading when running.

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difficult to accurately *****, you need to get the charging checked, even though you have a new alternater the problem could be as simple as the charging light not working, which causes the alternater to initiate. or you may have an electrical component staying on draining the battery.

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1 Answer

1983 Oldsmobile Delta 88 Electrical problem. I AM STUMPED


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