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willysmjeeps.com :: View topic - generator problems
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generator problems

 
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Bobber
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Joined: Feb 09, 2014
Posts: 178
Location: Tri Cities, Washington

PostPosted: Sun Oct 04, 2015 2:51 pm    Post subject: generator problems Reply with quote

Working on 1952 M38 early motor. I have a new generator and new solid state regulator that isn't charging. I polarized it and it was charging last week, but then I noticed the charge / discharge meter discharging. I grounded the gen case with jumper in the A or C pin hole and checked the B hole with the VOM and the starter. Still only produced 22 volts. BTW I did check to see if it was charging with VOM on the starter before I performed the test and the belts were tight. According to the results, the generator needs help.
Just wondering what the shop will tell me

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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Sun Oct 04, 2015 9:08 pm    Post subject: Reply with quote

Quote:
I grounded the gen case with jumper in the A or C pin hole and checked the B hole with the VOM and the starter. Still only produced 22 volts.


Not sure what you mean in this quote. A&C are the primary 24 volt output from the generator. There are no tests where you ground them. B is the field input. To test the generator you full field it by unplugging the plug on the generator. At the generator's connector connect your voltmeter positive (red) test lead to pin A or C & ground the negative (black) test lead and then start the jeep and then attach a jumper from the field terminal B on the generator to the plus terminal of the battery and the voltmeter should swing full 32 volts. Only do this for a couple of seconds. If the generator put out at least 28 volts the generator is good and your regulator is the issue.
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Bobber
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Joined: Feb 09, 2014
Posts: 178
Location: Tri Cities, Washington

PostPosted: Mon Oct 05, 2015 5:10 pm    Post subject: Reply with quote

I see my mistake. I'll check it again, hopefully I didn't damage anything.
Thanks
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