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Old 02-14-2012, 12:06 PM
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My 57 chevy pickup quit charging.

Original 235 six with a generator.

I did the following test that tests the generator itself.:

1. Disconnected the wires to the generator.
2. Grounded the F terminal on the generator.
3. Connected a volt meter to the other generator terminal and ground.

I started and revved the engine and only got about a .5 volt reading. This did not change when the F terminal was disconnected from ground.

Should I replace the generator now? Or is there something else I should do first? The generator looks pretty old and the casting is cracked where the front-top bolt goes through to the adjusting bracket.

Looks like I can get a new one for around $140.

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Old 02-14-2012, 01:47 PM
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The test procedure you used is not correct .
1 Disconnect the field and ground the field terminal on the generator .
2 Start the engine
3 Connect a volt meter across the Arm term and ground
4 Jumper the Arm and Bat term at the regulator
5 Increase engine rpm to about 2000 rpm observe voltage , donot exceed 16 volts also look in the rear of the generator , if there is excessive arcing the unit is toast
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Old 02-14-2012, 02:20 PM
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Quote:
Originally Posted by justold
The test procedure you used is not correct .
1 Disconnect the field and ground the field terminal on the generator .
2 Start the engine
3 Connect a volt meter across the Arm term and ground
4 Jumper the Arm and Bat term at the regulator
5 Increase engine rpm to about 2000 rpm observe voltage , donot exceed 16 volts also look in the rear of the generator , if there is excessive arcing the unit is toast
Thanks.

I just ran your test.

I couldn't detect any arcing from the rear of the generator.

After I started the engine and then connected the jumper from Arm to Bat, the voltage was in the 9s. I then revved the engine and got very inconsistent voltages. It went into the 10s then briefly into the 15s and back to 9s and 10s. Then I dropped to idle and it went back up to 12s. Then revved again and got 14s then back down to 9s.

Then I disconnected the jumper and revved the engine and got 14s but just briefly and then down to less than a volt.

I then shut down the engine and started again an re-ran the test. It wouldn't climb above 11s.

Bad brushes maybe?
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