Farmall H Generator Charging Issue

Farmall H, HV & Super H, 300 & 350, 1939-1958

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
User avatar
Urbish
501 Club
501 Club
Posts: 1116
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1948 Farmall Cub
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B
Circle of Safety: Y
Location: Manchester, MI

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?

User avatar
Stanton
Team Cub Mentor
Team Cub Mentor
Posts: 4274
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1945 Farmall H, serial #213,651
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

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...
Stanton
Image Circle of Safety

User avatar
Shane Nelson
501 Club
501 Club
Posts: 1669
Joined: Wed Nov 22, 2017 6:24 am
Zip Code: 27284
Tractors Owned: .
1947 Cub #1447 (Arnold)
1949 Cub (Walt)
1949 John Deere A
1972 Schramm Pneumatractor
1993 Ford 4630
1965 John Deere 110
1961 Cub Cadet Original
Circle of Safety: Y
Location: Oak Ridge, N.C.

Re: Farmall H Generator Charging Issue

Postby Shane Nelson » 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?
God is good, all the time!
Circle of Safety

User avatar
Urbish
501 Club
501 Club
Posts: 1116
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1948 Farmall Cub
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B
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.


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall H, HV, Super H, 300 & 350”

Who is online

Users browsing this forum: No registered users and 2 guests