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Evaluating Farmall H 12volt conversion

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Wisconsin_Joe

07-20-2007 01:14:31

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I"ll try to describe the wiring situation as best I can. If you flip the turn-off (not original of course)switch over it has 4 terminals the top two are the (run/on) position the bottom two terminals are jumpered to each other and are the (stop/off) position. The bottom left(stop/off)terminal has a wire coming from the push starter where the positive battery cable is attached. The bottom left then jumpers to the bottom right terminal. When I turn the switch to the "on" position both the top left and top right terminals become energized. The top left terminal has the warning "idiot light" wire and the top right terminal is wired to the coil and supplies power to a voltmeter. There is no jumper between the top terminals and I noticed the idiot light wire that runs to post #1 on the alternator is disconnected and dangling by the alternator. My first question is how do I handle the idiot light wire on the alternator because of the switch setup? Should the idiot light wire be moved over to the right side to the coil and voltmeter terminal. Obviously some one disconnected this from the alternator for a reason. The other thing I noticed is that there is another wire coming directly from the push starter where the positive battery cable is attached and runs directly to the alternator bat terminal. Just wondered if that was ok. Hope this makes sense, I am not well versed in this yet. Thanks as always

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Nat 2

07-20-2007 05:17:51

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Re: Evaluating Farmall H 12volt conversion in reply to Wisconsin_Joe, 07-20-2007 01:14:31

Okay, it sounds like it's wired to provide power to the idiot light and the coil, then separate them when the switch is off.

It's just fine the way it is. It's GOOD, in fact. There is no way to backfeed the coil from the alternator so the tractor won't keep running with the switch off.

Maybe the wire just fell off the #1 terminal on the alternator.

Maybe the alternator was replaced with one that is self-energizing. Does it charge without the idiot light being connected?

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Owen Aaland

07-20-2007 04:22:36

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Re: Evaluating Farmall H 12volt conversion in reply to Wisconsin_Joe, 07-20-2007 01:14:31

You will need to know if the top two terminals are electrically connected with the switch in the off position. If they are electrically isolated all you need to do is connect the wire and it should work fine. If they are electrically connected you will need a resistor or diode in that circut to keep the alternator from energizing the ignition circut when you shut off the switch.

If the alternator works without the #1 wire hooked up you have a "one wire'" alternator and do not need to connect the wire. If you do connect it the alternator will start to charge at a lower RPM. The single wire units usually need to spin at half throttle or higher before they start to charge. Once they start charging they should continue to charge even at low idle. Single wire alternators continue to draw a small amount even when not in use so for storage of longer than a month it is a good idea to disconnect the battery.

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