Farmall H Generator Charging Issue

Farmall H, HV & Super H, 300 & 350, 1939-1958
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Urbish
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Farmall H Generator Charging Issue

Postby Urbish » Wed Nov 09, 2016 9:11 am

I suspected that my H was not charging, but the ammeter didn't show any movement (even if I turned the lights on and off). So I replaced the ammeter last night and confirmed that I am not charging at all. I went through the procedure of applying voltage to the generator to make it 'motor' (pretty slowly I might add) and observed it motoring slower when I grounded the F terminal. So that appears to check out. With the tractor running, I am getting voltage jumping all over the place as measured with a digital multimeter. It rapidly fluctuates as high as the high teens and jumps negative, and everywhere in between. Any thoughts as to what is going on?
Jim

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Stanton
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Re: Farmall H Generator Charging Issue

Postby Stanton » Wed Nov 09, 2016 10:43 am

I do know that an analog type voltmeter is better suited to measuring these old tractors. Digitals want to jump around due to trying to read multiple times per second and getting varied hits.

I'm having trouble with my '45 H charging as well. Local electrical shop tests it out as being ok, but it won't charge the battery. Ammeter shows discharge when lights are "on", but nothing otherwise, so feel my ammeter is good. Am seriously considering converting to 12v with alternator...
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Re: Farmall H Generator Charging Issue

Postby Slim140 » Wed Nov 09, 2016 10:47 am

Could it be the regulator in both y'all's cases? Aren't there some contacts in there that can get dirty kinda like points?
Every home is a school, what are you teaching?

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Urbish
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Posts: 2296
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B

Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
Cub Loboy L-54 Leveling and Grader Blade
Unknown 5' Single Gang Disc Harrow
Circle of Safety: Y
Location: Manchester, MI

Re: Farmall H Generator Charging Issue

Postby Urbish » Wed Nov 09, 2016 12:41 pm

I will try an analog voltage meter.

My wiring is original (in poor condition) and may be causing some of my trouble. I suppose that's where I should start. I have a cutout on mine. The cutout is opening and closing in response to battery voltage drop. Maybe I'm just not passing enough current back to the battery due to the bad wiring.
Jim

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Re: Farmall H Generator Charging Issue

Postby mikes5785 » Fri Sep 13, 2019 9:58 am

Tha ammeter also needs a good ground in order to function. There are at least 3 places in that ground path to checked & cleaned

1. Meter to the dash cover.
2. The cover to the box.
3. The box mount to the steering wheel support/mount

In other words any place that metal touches metal between the meter and the tractor itself

Mike

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Urbish
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Posts: 2296
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B

Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
Cub Loboy L-54 Leveling and Grader Blade
Unknown 5' Single Gang Disc Harrow
Circle of Safety: Y
Location: Manchester, MI

Re: Farmall H Generator Charging Issue

Postby Urbish » Fri Sep 13, 2019 11:22 am

mikes5785 wrote:Tha ammeter also needs a good ground in order to function. There are at least 3 places in that ground path to checked & cleaned

1. Meter to the dash cover.
2. The cover to the box.
3. The box mount to the steering wheel support/mount

In other words any place that metal touches metal between the meter and the tractor itself

Mike


Thanks for reviving my once-dead topic. In my case it was the screws that hold the ammeter/light switch box together. The cover wasn't grounding well to the box. I added some star washers on the back side under the nuts and all was good, oh and a new ammeter.
Jim

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Re: Farmall H Generator Charging Issue

Postby Scrivet » Wed Sep 18, 2019 10:19 pm

mikes5785 wrote:Tha ammeter also needs a good ground in order to function. ...........
That doesn't sound right to me, unless it has a lighting circuit.
I know the cutout charging circuit that goes through the light switch needs a good ground, but have never heard of an ammeter needing a ground.
Urbish wrote:........ I added some star washers on the back side under the nuts and all was good, oh and a new ammeter.
I think the new ammeter made all the difference.

mikes5785
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Tractors Owned: 1949 C, 1953 Super M, 1953 Super H, 1955 Cub LoBoy, 1967 Cub LoBoy, ?? 574

Re: Farmall H Generator Charging Issue

Postby mikes5785 » Wed Sep 18, 2019 10:51 pm

Scrivet wrote:
mikes5785 wrote:Tha ammeter also needs a good ground in order to function. ...........
That doesn't sound right to me, unless it has a lighting circuit.
I know the cutout charging circuit that goes through the light switch needs a good ground, but have never heard of an ammeter needing a ground.


I got that information from more than 1 source. The service manager at the local Case/IH dealer who is scoring a solid +90% on issues I go to him with on these old gems, and a handful of old time local farmers that were/are decent mechanics in their own right.

Make sure the channel around the dash cover, the edge of the dash box, the steering support where it connects to the dash box and the connecting bolt are all clean n shiny

Urbish wrote:........ I added some star washers on the back side under the nuts and all was good, oh and a new ammeter.
I think the new ammeter made all the difference.[/quote]


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