1988 GMC 2500 P/U Alternator ? - Team Camaro Tech
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post #1 of 3 (permalink) Old May 25th, 12, 10:28 PM Thread Starter
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Al
 
Join Date: Nov 2002
Location: Vancouver, USA
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1988 GMC 2500 P/U Alternator ?

Hi guys -

Sorry for the long post - need help.

Working on a friend's truck. 1988 GMC 2500. Did the loose/sloppy tilt column repair, and in the process pinched the harness to the turn signal stalk, which caused the wipers to be on high speed as soon soon as key turned to run. Took it apart, found and repaired the pinched harness and he went on his way.

Next day, battery was dead. Tested voltage at batt posts with engine running- batt voltage only. Tested at stud on alternator, engine running, batt voltage only. Removed fat red wire from stud, started engine - .25 volts at back of alt at idle, about 2 volts with some RPM.

Took alt to Autozone - alt failed test. Bought new alt and installed - same issue - minimal voltage from alt.

I believe this is a CS alternator. Big stud and a 4 pin plug. Only one wire in harness to 4 pin plug - green as I recall. (excite wire?)

One other thing - after steering column fiasco, noticed that voltmeter not working. Is it possible the excite wire feeds through the voltmeter and with the pinched harness the gauges fuse blew?

Any and all ideas much appreciated!! Thanks!!


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post #2 of 3 (permalink) Old May 26th, 12, 01:40 AM
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Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
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Re: 1988 GMC 2500 P/U Alternator ?

That one wire is the turn on signal if it's on the terminal marked "L" for light (dash light). With the key on does the dash light turn on? It should send 12V across the light bulb and then out to the alternator to turn on so check for 12V on that one wire with key on.

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post #3 of 3 (permalink) Old May 27th, 12, 09:58 AM Thread Starter
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Al
 
Join Date: Nov 2002
Location: Vancouver, USA
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Re: 1988 GMC 2500 P/U Alternator ?

Thanks Steiner.

My initial thought was correct - the "gauges" fuse was blown, and the excite wire and the "BATT" light are on that circuit. All is well now. Seems funny to me me though that if that fuse blows it keeps the alt from making power and kills the light that would tell you the alt isn't making power. The first thing you notice is a dead battery.


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