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  #1  
Old 07-26-2000, 03:37 PM
JERRY88GW JERRY88GW is offline
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Join Date: Jun 09, 2000
Location: Alexandria, VA, USA
Posts: 242
Question

Every time I crank her the voltage meter is way down. 8 volts. She cranks up/runs fine. The voltage will stay there until I get up to about 50 mph, then it will jump up to 13 - 14 volts and stay there until I turn her off.

It's been doing this since I got my GW a year ago. Havn't had any problems with it, except dim lights at night because of the low voltage.

I guess it's one of three things: battery, altenator or voltage regulator.

Anyone know a fix to this?

Thanks!
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  #2  
Old 07-26-2000, 04:22 PM
Rick
 
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i have been having the same problem with my 85, the voltage is somewhat low at idle, but when i speed up it gets this nervous tick. and at night i get this light show due to the alt kicking in and out. in my best opinion it is most likely the alt. the only reason i havent done anything is because i plan on upgrading to a high output alt and a red top optima in the near future.

my advise is to have the alt tested then the battery and go from there.

also check the grounds. this can cause a major headache on the electrical system.

good luck.

------------------
87 Grand wagoneer (stock, for now)
85 Grand Wagoneer LTD (soon to be parts beast)
NP 208
Warn Locking Hubs
15x8 Black RockCrawlers
And still piling up parts
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  #3  
Old 07-26-2000, 05:57 PM
TPIGUY TPIGUY is offline
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Join Date: Jul 22, 2000
Location: Columbus, GA, USA
Posts: 176
Wink

Guys, I have a Cherokee with an Ammeter. I was on vacation in Florida when I noticed the Ammeter doing the cha-cha in a major way. It would swing from 0 to about 40 amps and back to 0 about once every second. I put up with this for 2 more months thinking it will just go away or strand me on the way to the bank to deposit before 2 PM (the worst scenario I can think of). Anyway, I replaced the alternator and it went away. My guess is that it's something in the alternator's regulator.
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  #4  
Old 07-27-2000, 04:40 PM
JERRY88GW JERRY88GW is offline
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Join Date: Jun 09, 2000
Location: Alexandria, VA, USA
Posts: 242
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It's probably the Voltage Regulator.
Acording to the TSM it's located in the rear housing of the alternator, and is un-serviceble. Just have to replace the whole alternator.
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  #5  
Old 07-28-2000, 07:01 AM
BobBarry
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by JERRY88GW:
It's probably the Voltage Regulator.
Acording to the TSM it's located in the rear housing of the alternator, and is un-serviceble. Just have to replace the whole alternator.
<HR></BLOCKQUOTE>

The regulator is not serviceable in itself, but it is replaceable and won't cost more than $10. Remove the alternator, open it up, unscrew the old regulator, screw in the new one, and reinstall the regulator.

Look at a picture of one at:

http://www.profitpro.com/partinfo/bor/docs/bor_R291.htm

But that is definitely what the problem sounds like.

------------------
Bob Barry<UL TYPE=SQUARE>* '78 Cherokee 4-door
* '88 Grand Wagoneer[/list]http://studentweb.providence.edu/~rbarry/wheels/
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  #6  
Old 07-28-2000, 08:09 AM
JERRY88GW JERRY88GW is offline
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Join Date: Jun 09, 2000
Location: Alexandria, VA, USA
Posts: 242
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Thanks for your help,

Since it's cheap I'll change it soon.

Jerry
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