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post #1 of (permalink) Old 07-07-2001, 02:24 PM
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Troubleshooting a Alt

Hi,
Could someone lay out the basic troubleshooting steps for a Alt? I have a high output GM alt and it doesn't appear to be charging the battary properly. I drove the sam for about 25 miles yesterday but when I looked at the battery charge indicator this morning it was black which means it has only about 50% charge. Also yesterday, when I started the motor I heard a high pitch squeel which seems to come from the Alt. The only thing I have recently changed was to add in a instrument cluster with the tach in it.
Again, thanks in advance for any and all help.

Glen
Calmini S/R
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post #2 of (permalink) Old 07-07-2001, 05:28 PM
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Re: Troubleshooting a Alt

take it to alt shop or autozone so they can do a load test on it that is the best way to test a alt

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post #3 of (permalink) Old 07-07-2001, 08:56 PM
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Re: Troubleshooting a Alt

Hi

Quick easy test for any alternator is carefully disconnect
alternator output wire. Then start engine you can here
and feel alternators load on engine as you make and break
alternator circuit. Purposely discharge bat. then do above
alternator test if have amp meter wire in series you can
monitor charge current.

Carefull alternator wire is always hot +12Vdc





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post #4 of (permalink) Old 07-08-2001, 06:44 AM
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Re: Troubleshooting a Alt

If it is a used alt then the brushes are most likly shot.
(Is the batt known good? good water levels?) throw a volt meter on that suckers output while runing, (Big connection)
and you should have around 14 volts. if not then it is not happy.
The bearings are avalible through NAPA-online. Including the rear needle bearings. If you rebuild then do all of them (2) and the brushes of autozone sells a lifetime swap
for 75.00

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post #5 of (permalink) Old 07-09-2001, 11:58 AM
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Re: Troubleshooting a Alt

It's a new Alt, only a few months old, purchased from Petroworks. I put a meter on the battery while the vehicle was running and it was showing over 15 volts. Would this actually be over charging the Battery? When the Suzuki was in the garage and I looked at the battery indicator it looked to be black, but when I had the vehicle running and looked again and it was definetly green. Now I'm just concerned about the high, over 15 volt reading at the battery, I would hate to ruin it.
Thanks

Glen
Calmini S/R
post #6 of (permalink) Old 07-09-2001, 12:08 PM
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Re: Troubleshooting a Alt

ok its show 15v with meter is that hooked up to the battery? if its showing 15 volt while its hooked up to the battery yes thats a little to much. but my alnt puts out 14 volts and have had no problems .dude take it to autozone and have have them check it with there machine . they dont charge anything . that way you will no for shure if its over chargeing .

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post #7 of (permalink) Old 07-09-2001, 12:12 PM
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Re: Troubleshooting a Alt

of cours i just looked at your profile and seen you live in alaska you might want to leave it alone that way your heater blower will blow faster LOL . i had to say that .

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post #8 of (permalink) Old 07-09-2001, 12:14 PM
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Re: Troubleshooting a Alt

i have seen alot of those gm alt internal reglators do that it just needs replaced .

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