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Alternator or Something Else?

 
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Old 08-30-2012, 09:50 PM
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Alternator or Something Else?

-Car originally idled at 1100 rpm as far as I can remember.
-Battery drained cause I don't drive the car so I jumped it and charged it with the alternator.
-Lately it's been idling at 700 rpm.
-Car on voltage is at mid to low 14V's when on.
-High to mid 13V when headlights and foglights on.
-Mid 12V and dropping when headlights, fog lights, and A/C on.
-I take the car to AutoZone and they tell me the alternator is fine while on the car.
-Take it off and have them bench test it and they tell me the same thing. Passed.
-I checked the belt and it had tension on it before hand.
-The only other thing I can think of is I don't really use the A/C so the clutch could be seizing or I recently changed my header and exhaust and put an anti-fouler that spaced out the O2 sensor.
-Any ideas?
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Old 08-30-2012, 11:13 PM
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Re: Alternator or Something Else?

700+- 50rpm is where it should be idling on a warm engine. Your voltages will drop as each accessory is turned on (headlights, foglights, a/c, etc). When the a/c compressor kicks on, your lights may slightly dim for a quick second, that's normal.
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Old 08-31-2012, 10:32 AM
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Re: Alternator or Something Else?

~1200 is normal idle for a cold engine.
700 is normal for a warm engine.


Your engine is fine
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Old 08-31-2012, 10:47 AM
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Re: Alternator or Something Else?

if youre not dropping in voltage then your alt is fine
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Old 08-31-2012, 02:22 PM
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Re: Alternator or Something Else?

It sounds all good to be, but if your really worried about voltage, you could upgrade your big3
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Old 08-31-2012, 03:26 PM
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Re: Alternator or Something Else?

Dang 700? mine idles around 500 when hot.
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Old 08-31-2012, 07:31 PM
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Re: Alternator or Something Else?

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Dang 700? mine idles around 500 when hot.
then adjust it. mine did the same. all it needed was adjusting
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Old 09-02-2012, 10:51 PM
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Re: Alternator or Something Else?

I tried to adjust mine but i just get more of a whistle through the intake.
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