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Order Farmall Cub Parts Online

1948 Farmall Cub, Wiring for 12 Volt Alternator

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Jim Berthay

11-08-2001 12:50:56




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I'm Converting a 1948 Farmall Cub, generator wiring to a 12 Volt, one wire GM type Alternator.
How do you wire the Ammeter so it will function
properly, using the original light switch and
seperate on off switch? The Alternator is self-regulating--thus no regulator is being used. Thanks.




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Bob M

11-08-2001 15:44:47




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 Re: 1948 Farmall Cub, Wiring for 12 Volt Alternator in reply to Jim Berthay, 11-08-2001 12:50:56  
Jim - Wire the ammeter as follows: 1 - Connect the alternator BAT terminal to the "+" terminal on the ammeter. (If the ammeter terminals are unmarked, just choose one and connect to it....). 2 - Connect the remaining ammeter terminal to the battery positive. This connection is usually most conveniently made where the battery positive cable bolts to the starter switch. 3 - Supply both the ignition and light switches from the ammeter "+" terminal.

Test by turning on the lights or the ignition with the motor stopped. If the ammeter shows a negative (discharge) reading you are all set. If the ammeter indicates positive (charge), swap the wires at both ammeter terminals - it will now read correctly.

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