Voltage Drop Question??

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Sep 12, 2011 | 03:22 PM

#16

BigVaz

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From: Kenosha, Wi

Year: 2000

Model: Cherokee

Engine: 4.0L I-6

Ok, so what else would cause the voltage to drop if the battery seems fine? (since it starts up with no hesitiation) Also assuming the Alt. is fine?

I guess I don't understand what a few of you are thinking the issue is?

Sep 12, 2011 | 03:55 PM

#17

99FreshenedCherokee

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From: Laredo Texas

Year: 1999

Model: Cherokee

Engine: 4.0l

Well if you want to know for sure you should do what i did.I went to autozone and a guy there told me that if i wasnt sure it was the alt. I can just go back and reutrn it. and to my luck it was my alt. this was the thread i made the day it happened to me: https://www.cherokeeforum.com/f59/damn-103780/

Sep 12, 2011 | 04:30 PM

#18

BigVaz

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From: Kenosha, Wi

Year: 2000

Model: Cherokee

Engine: 4.0L I-6

Im going to hit autozone on the way home. I called & they said they'll check the Bat, Starter & Alt in that order.

So we'll see...

Sep 14, 2011 | 11:05 AM

#19

BigVaz

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From: Kenosha, Wi

Year: 2000

Model: Cherokee

Engine: 4.0L I-6

So last night I pulled the Alt & took it to Autozone. It screamed like a pig on the tester & failed with flying colors!

So i was happy to know exactly what the problem was.

Wrenching time for removal of old & new install was 40mins... Not bad for the 1st alternator i've ever done... *Patting my own back*

Sep 14, 2011 | 11:37 AM

#20

99FreshenedCherokee

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Joined: Dec 2010

Posts: 550

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From: Laredo Texas

Year: 1999

Model: Cherokee

Engine: 4.0l

Great Job! and happy to see it was the alt.

Jan 25, 2012 | 03:39 PM

#21

86-Chief

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Joined: Jan 2012

Posts: 516

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From: Southern Cali

Year: 1986

Model: Cherokee

Engine: 2.5L turbo, 4.0L tb swap, ported head ect

Quote:

Originally Posted by BigVaz

So i was heading to work today & my voltage dropped completely. When I got to work I popped the hood & disconnected the negative battery terminal & the motor instantly died.

Im not a mechanic, but im assuming its the alternator that needs replacing? Over the last couple days I was getting a faint, but weird hum out of the engine bay too? Guessing that had something to do with it too...

Any guidance is appreciated.

Thanks!

your supposed to disconnect the positive battery cable because the alternator should pump enough voltage to keep it running