Re: Model A 12 Volt conversion

Posted by Bob M on May 23, 2001 at 05:22:05 from (192.232.119.194):

In Reply to: Model A 12 Volt conversion posted by Eric on May 22, 2001 at 19:32:43:

Eric - Problem could be one of several things:

1 - The alternator is wired up wrong. You should read about 12.6 volts at the alternator BAT terminal with the motor stopped, and 14+ volts with it running. If the alternator is NOT working you'll see about 12 volts at the BAT terminal with the motor running. A reading of 1 volt says there's no connection between the battery and the alternator.

2 - Presuming now the wiring is correct, the Delco alternator needs to be spun up to a fairly high RPM before it will "turn on" and begin charging, just as you suspect. But once it turns on it will continue to charge even at low RPM. Problem simply may be your motor turns to slow - even at max governor - to cause the alternator to turn on. So try running the motor at max RPM for a couple seconds after starting and see it it begins charging. If it does not, a solution is to install a SMALLER pulley on the alternator to cause it to spin faster. (Note: The so called "single wire" alternators are particularly troublesome in this respect - they must be spun up much faster than standard 3-wire alternator setups to get them turned on. That's why I' not a big fan them on tractors, etc...)

3 - Again presuming the wiring is OK, you may simply have a failed alternator. To find out, remove it and bring it to your friendly NAPA, AutoZone, etc. and ask 'em to test it for you. Most places will test alternators for free.

Hope this helps...

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