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YACT: electrical problem

A

alphatarget1

Diamond Member
my mom's 97 altima probably has an electrical problem. when it's idling with lights and accessory on (higher demand from the electrical system?) it idles kinda rough, only at around 550rpm. the RPM drops pretty bad when i'm idling and turning accessories on. checked the voltage with a multimeter and it's like 1 or 2 volts lower than it's supposed to be. alternator was replaced like 2-3 years ago. what else could be wrong?
 
Originally posted by: Heisenberg
What was the voltage across the battery when it's idling?
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11~12v

supposed to be 14v... that's the spec in the service manual. the voltage regulator is integrated in the alternator.
 
could loose belts/improper tension affect that?

the car isn't breaking down yet so hehe... i'll wait till the alternator dies before i change it.
 
Yeah, if the belt's worn it can slip and cause a low output. I'd check that first since it's the easiest. I wouldn't wait to have it fixed.
 
Wouldn't hurt to check for loose connections. Around here, I'd be looking for corrosion, but since your in CA, that's not too likely.
 
Originally posted by: Heisenberg
Yeah, if the belt's worn it can slip and cause a low output. I'd check that first since it's the easiest. I wouldn't wait to have it fixed.
Click to expand...

oye..I learn something new everyday.
 
Sounds like an idle control problem. I would check the throttle body and idle air pass by valve for dirt and clean as necessary.
 
Originally posted by: Quixfire
Sounds like an idle control problem. I would check the throttle body and idle air pass by valve for dirt and clean as necessary.
Click to expand...

I agree, my first instinct wasn't electrical either. If there's enough juice to run the engine, it should run all the same.

But ya never know.
 
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