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Discussion Forum

H Electrical Problems

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09-04-2002 19:02:40

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My 1941 H is driving me crazy. After new generator, voltage regulator (not a cutout), wiring, battery, cables, it STILL DOES NOT CHARGE. When I pull out the ignition switch, it shows a small amperage discharge. When it is running, no matter what the 4-position switch position (low, high), it shows a small discharge. If the lights are turned on, it shows a big discharge. The generator has been polarized. Give me some diagnostic steps to take. Thanks.

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Bob M

09-05-2002 08:21:52

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 Re: H Electrical Problems in reply to Travis, 09-04-2002 19:02:40  
Travis - Recommend proceeding as follows:

1 - Check (then check again!) to make sure the wiring is correct. Since your H has a 4-position light switch, the tractor was orginally equipped with a cutout relay. Since it now has a voltage regulator, the wiring has to be modified slightly to accommodate the regulator. Punch below for a diagram of how it should wired up now.

2 - Make sure the regulator is solidly grounded. Run a temporary ground wired directly from the regulator mounting base to the grounded battery terminal.

3 - Repolarize the generator. Momentarily connect the BAT and ARM terminals at the regulator with the engine off. Soon as you see a spark you've successfully polarized.

4 - Start the motor and run at 1/2 throttle. Temporarily jumper the BAT and ARM terminals at the regulator. If the ammeter now indicates charge, the regulator is bad.

5 - If still no charge, temporarily connect a jumper wire between the generator "F" terminal and a good ground. If the ammeter indicates charge, once again the regulator is bad. Otherwise the problem is in the generator.

Note: Since you now have a voltage regulator, the light switch no longer has any effect on the charge rate. The L and H positions are simply two "off" positions for the lights.

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RAY in PA.

09-04-2002 19:52:14

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 Re: H Electrical Problems in reply to Travis, 09-04-2002 19:02:40  

Check to make sure that you have the battery grounded correctly. You probably have the wrong battery terminal grounded.

Ray in Pa.

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Kelly C

09-04-2002 21:29:08

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 Re: Re: H Electrical Problems in reply to RAY in PA., 09-04-2002 19:52:14  
Mine was wired backwards when I brought it home.
6 volt H's need a possitive ground. I switched the cables and now my amp meter reads discharge when running. But it is really charging. I just needed to switch the wires on the meter.
Here are some photos of what mine looked like.

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