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Old 09-15-2003, 09:42 AM   #1
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Charging

a general question- if one of the coach batteries is bad, will that effect the charging output ( as read by the dash gauge) for the alternator?
My belt was loose, I tightened it up, but the readings are still 12-12.5v output, and with the lights on it drops into the unacceptable range. Thanks

It could be that my old bad grounding problem is back again, I replaced wires last time and heat wrapped them , but that is still a possibility.
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Old 09-15-2003, 10:57 AM   #2
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The charging output from the alternator should be around 14-16 volts. It won't matter if the batter is good, bad, ugly, pretty, cheap, or expensive. I would have the alternator checked if your getting low voltage. You may have a bad voltage regulator and the alternator still be good.
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Old 09-15-2003, 11:05 AM   #3
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Alan,

I would start by checking the output at the alternator. Your coach should hava battery isolator. If the isolator is going bad it could be causing the low readings. The input on the isolator should be the middle post.

Another option is to disconnect the alternator from the isolator and connect it to the main coach feed. Then start it and see what kind of readings you get.
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Old 09-15-2003, 11:13 AM   #4
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A bad battery can fry an alternator. Pull the bad battery out and see how it does.
I am finding out the high amp GM alternaotrs ar bad about cracking a inter insulator where a screw holds eith the diaods or the regulator into the back of the housing. It's not a real obvious problem. Local place off Canton Hwy rebuilt my 105 amp for $60 in about 2 hours. I'm happy with his work and he stood by it when we found I had just suck a crack that his bench guy missed. Place is called BP rebuilders. 770.427.5872
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Old 09-16-2003, 10:45 AM   #5
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thanks guys. My isolator and alternator were replaced last summer, and all has been well until I recently had the loose belt syndrome. Tightened it up and ran 14+ volts. Then it seems to have loosened up again, retightened, but no move from 12volts on the gauge. The belt looks to be in good shape, a GATES and the rubber seems fine, I think my bolts were loosening.
I do have a bad house battery, as it holds a charge for only a few days.
Sealed so i can't check the cells. I used my portable charger not the AS.
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Old 09-16-2003, 02:12 PM   #6
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Allen:

Check the plug on the top of the altenrator and make sure it's fully seated. GM alternators require a feild voltage to start charging. It's basicly switched battery power from the ignition. That is introduced on the 1 or two wire plug on the top. The latch clips break off when they get old. Once that clip pops off it's real easy to have that come unplugged. You might have knocked that connection when you tightend the belt.
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