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Old 02-23-2011, 12:27 PM   #1
Bob Wise
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Default Model A Ford generator

My generator is not charging...what is the best way to test on the car? Not sure if the cutout is bad...
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Old 02-23-2011, 01:58 PM   #2
BRENT in 10-uh-C
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Default Re: Model A Ford generator

Disconnect the Cut-out wiring and remove the Cut-out from the Generator. Next remove the fan belt. Using a set of jumper cables connected to a charged battery, connect to the Generator and see if it will spin like a motor. If so, in all liklihood it will charge and therefore consider swapping out and installing a good Cut-out with a diode in it.

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Old 02-23-2011, 02:39 PM   #3
Bob Wise
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Default Re: Model A Ford generator

Thanks Brent!
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Old 02-23-2011, 08:26 PM   #4
barnstuf
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Default Re: Model A Ford generator

Brent's advice is right on the money but I would like to add a bit of advice if you do have to buy a cutout with a diode. Buy it from a Model A Ford parts dealer and not from a flea market casual vendor. Why do I say that? It is because current goes thru a diode only one way. The Model A is positive ground. The Model T is negative ground, so the diode cutout for the A will not work on a T and the T diode cutout will not work on the A. A casual flea market seller may not know which one he is selling as they look alike.
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Old 02-23-2011, 09:16 PM   #5
Tom Wesenberg
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Default Re: Model A Ford generator

Start the engine and set it to a fast idle, then jump across the two cutout terminals. If it now shows a charge the cutout needs the contacts cleaned, or the pull in winding is bad. If the amp guage still shows a charge after the jumper wire is removed, then the generator just needed to be polarized.

Don't run a Model A generator for more than a few seconds if it's not connected to the battery, or it may burn itself up. If the cutout is faulty, then the generator isn't connected to the battery. In case of a faulty cutout, you can safely run the generator by jumping the output post to ground.
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Old 04-16-2011, 09:38 AM   #6
Bob Wise
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Default Re: Model A Ford generator

Removed the cut-out, fan belt and ran a jumper from the starter cable (neg) to the post on the generator and got a spark...looks like the generator is shorted and needs attention...I also have lost two condensors during the time that the generator was not charging.
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Old 11-24-2013, 04:44 PM   #7
joeflh
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Default Re: Model A Ford generator

Thanks to all of you got the old 31 ford charging again
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Old 11-25-2013, 06:28 AM   #8
Bruce of MN
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Default Re: Model A Ford generator

Quote:
Originally Posted by Tom Wesenberg View Post
Start the engine and set it to a fast idle, then jump across the two cutout terminals. If it now shows a charge the cutout needs the contacts cleaned, or the pull in winding is bad. If the amp guage still shows a charge after the jumper wire is removed, then the generator just needed to be polarized.

Don't run a Model A generator for more than a few seconds if it's not connected to the battery, or it may burn itself up. If the cutout is faulty, then the generator isn't connected to the battery. In case of a faulty cutout, you can safely run the generator by jumping the output post to ground.
Is the procedure any different if you have a diode cutout (bought from a major shop)? My gen motors, but doesn't give more than battery voltage at a fast idle and the 3rd brush pushed all the way down.
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Old 11-25-2013, 09:26 AM   #9
Tom Wesenberg
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Default Re: Model A Ford generator

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Originally Posted by Bruce of MN View Post
Is the procedure any different if you have a diode cutout (bought from a major shop)? My gen motors, but doesn't give more than battery voltage at a fast idle and the 3rd brush pushed all the way down.
Same procedure for the diode cutout. Jump the two terminals with the engine at fast idle, then if it still shows no charge the generator most likely needs to be repaired. Check the voltage with a seperate meter to see if it rises above battery voltage.
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Old 11-25-2013, 10:19 AM   #10
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Default Re: Model A Ford generator

Thanks, I'll do this.. I always thought that motoring was a reliable sign that the generator was OK.

Quote:
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Same procedure for the diode cutout. Jump the two terminals with the engine at fast idle, then if it still shows no charge the generator most likely needs to be repaired. Check the voltage with a seperate meter to see if it rises above battery voltage.
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