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Old January 19th, 2004, 08:49 AM
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'97 D-90 ST #1507
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Alternator/Battery problem - Repost

Repost of my troubleshooting from Saturday.
Update from my alternator/battery problem-

Charged the battery and started my truck then disconnected the neg. battery cable and ran for 15 minutes then I shut it off. This rules out the alternator.?

Broke out my bran-spankin' new multimeter and checked the milli-Amps of draw through neg. cable and got:

3.6mA with red lead on battery terminal and black lead on battery cable and
-2.1mA with the leads reversed I'm not sure why the numbers are different? I understand why the sign + vs. - is different. I guess I'll have to dust off the physics books tonight.
Are these reasonable #'s, IE not too high?.....

I also pulled all the fuses one at a time and these # didn't change at all.

I also checked the battery voltage across the terminals and got:
12.55V with battery disconnected
12.53V with battery connected
13.95V with truck running
13.90V with truck running high beams, heater and hazard lights all on.
I've heard that around 14V is normal. Is that correct?...

As a side note while the engine was running and I went to turn on the heater I hit the windshield wipers by mistake and they blew the fuse. I replaced the fuse and turned them on again and they don't blow the fuse until they go into high, low and spray are fine. Any ideas? I don't think this is related to my battery problem because when I check for draw with the windshield wiper fuse out I get the same reading. I there a relay that I should check?

Sorry for the long post,
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Old January 19th, 2004, 09:57 AM
Mike Hippert's Avatar
Mike Hippert
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94 D-90 Grinding Rover
Join Date: Sep 2003
Location: Manchester NH USA
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Man I wish I saved my reply.

OK here it goes.

Alt, Batt, and Diode sounds like they are Good.

The #s are very close 3.6 - 2.1 = 1.5 not much different could be the meter. Remember when you swapped the leads on the meter the current is going through the meter back-wards thus the - reading. They are low witch is good, that should not be enough to drain your battery even over several days of not running.

No change in #s when pulling fuses means there is something that is always on like the yellow memory wire for your radio.

All the voltages sound good.

I would check the fuse to make sure you did not put the wrong size in when you were pulling them out. It could be a ground or relay problem also.
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