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EFV-8 Club Forum / General Ford Discussion / Generator Cutout

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Discussion Topic: Generator Cutout

Oldad

06-26-2012 @ 7:41 PM

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Posts: 111
Joined: May 2012

I bought my 1937 Ford at an estate auction. The owner was deceased and his on-in-law put a new battery in it for the auction.
The car was started the day of the auction and I noted fuel leaks at the fuel pump and carb. After I bought the car I decided to trailer it to my shop because of the fuel leaks. I noticed when I loaded the car that the amp meter was showing a discharge and at higher rpms the discharge increased.
When I got it to the shop I noticed the negative terminal was connected to ground. I switched the battery to positive ground and the amp meter showed normal charge. Then I noticed that there was an 8-10 amp draw on the battery with everything off. I disconnected the cutout on top of the generator and it cured the power drain.
Did running the car with the battery polarity reversed blow the cutout? If so, should I do anything in addition to replacing the cutout?

supereal

06-26-2012 @ 8:17 PM

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The facts point to a cutout with the points stuck together. It is likely that this caused the battery to run down, thus the replacement. When the cutout sticks, the battery tries to turn the generator into a motor, and can deplete the battery quickly. If you had a two brush generator, it would be worth a try to "polariize" it, but you have the three brush type, so disconnect the cutout, remove it, and check to see if the points are free. The system is designed to close the points when the generator output exceeds the battery voltage, and disconnect when generator is not needed. It is likely a new cutout will be needed.

Oldad

06-26-2012 @ 8:46 PM

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Thanks, Supereal!

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