Generator not charging

The Cub Club -- Questions and answers to all of your Cub related issues.
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.
cdahl383
Cub Star!!
Cub Star!!
Posts: 253
Joined: Wed Mar 22, 2023 8:01 pm
Zip Code: 48162
Tractors Owned: 1949 Farmall Cub

Generator not charging

Postby cdahl383 » Wed Sep 20, 2023 1:30 pm

I've noticed the last couple times I got my tractor out that the generator isn't charging the battery. It's a 1949 Cub with magneto ignition (I believe that model has the cut out relay vs the voltage regulator on later models). It was acting up a little back in the summer but I figured it was just the belt slipping. Now it doesn't want to charge at all. I thought it might have been the gauge, but when I turn the lights on it shows a discharge on the amp gauge.

I kind of suck with diagnosing electrical problems. Where should I start? Hoping it's just something simple like a bad ground or something.

It's odd because when I flip the switch from L to H I can hear the engine pull down a little like before when it was charging, but nothing shows on the gauge. I also noticed the switch itself gets kind of warm (the dial part you turn, etc). The battery still starts the tractor fine, but eventually I'll have to charge it with my battery charger.

Any help is appreciated!

tst
10+ Years
10+ Years
Posts: 5160
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Generator not charging

Postby tst » Wed Sep 20, 2023 7:11 pm

flow chart
Attachments
07-Cutouttroubleshootingchartrev1_0.gif

cdahl383
Cub Star!!
Cub Star!!
Posts: 253
Joined: Wed Mar 22, 2023 8:01 pm
Zip Code: 48162
Tractors Owned: 1949 Farmall Cub

Re: Generator not charging

Postby cdahl383 » Wed Sep 20, 2023 9:14 pm

tst wrote:flow chart


Cool! Thanks man! I’ll try this out over the weekend.

I already tried the first step just to see if the gauge was acting up. It shows discharge with the lights on. Do the gauge is good. Will have to try the rest of the list.

NJ Farmer
10+ Years
10+ Years
Posts: 350
Joined: Fri Feb 04, 2005 7:20 pm
Zip Code: 08876
Tractors Owned: 1953 F-Cub
1957 F-Cub
1956 Lo-Boy
1971 Cub Cadet 149
1976 Cub Cadet 1200
Circle of Safety: Y

Re: Generator not charging

Postby NJ Farmer » Thu Sep 21, 2023 9:56 am

Make sure your connections are clean and corrosion free. I also like to but Dow Corning 4 dielectric grease on ALL electric connections including battery terminals. Make sure your voltage regulator is properly grounded ie the regulator base has a clean paint free connection to the metal mounting base. Everything on generator system depends on good grounds. Finally with the battery switch turned on you need to “flash the field” of the generator by briefly taking a jumper lead to the “A” or armature lug on the generator and the battery lug on the regulator to get a quick spark.
DO NOT TOUCH THE “F” lug on the generator to the battery this will damage the voltage regulator.

See Farmall Cub service manual for pictures of the location of the generator lugs and voltage regulator lugs.

NJ Farmer

CharlieK
10+ Years
10+ Years
Posts: 788
Joined: Sun Apr 10, 2005 9:25 pm
Zip Code: 40165
Location: bullitt county, kentucky

Re: Generator not charging

Postby CharlieK » Thu Sep 21, 2023 10:24 am

"make sure your connections are corrosion free"


^^^^^^^^^^^^^^^^^^^^^ a must
get er done; life is good

cdahl383
Cub Star!!
Cub Star!!
Posts: 253
Joined: Wed Mar 22, 2023 8:01 pm
Zip Code: 48162
Tractors Owned: 1949 Farmall Cub

Re: Generator not charging

Postby cdahl383 » Thu Sep 21, 2023 2:48 pm

Thanks! Yeah some of those wires look pretty sketchy under there. I'm sure they have some corrosion on them. I had the same problem with the battery cables when I first got the tractor. The cables were too small and all the contacts were dirty with corrosion on them. After cleaning everything up and getting some new heavy cables it fires right up with the 6V battery.

NJ Farmer
10+ Years
10+ Years
Posts: 350
Joined: Fri Feb 04, 2005 7:20 pm
Zip Code: 08876
Tractors Owned: 1953 F-Cub
1957 F-Cub
1956 Lo-Boy
1971 Cub Cadet 149
1976 Cub Cadet 1200
Circle of Safety: Y

Re: Generator not charging

Postby NJ Farmer » Fri Sep 22, 2023 1:04 pm

See if you can find IH Blue Ribbon Service Manual GSS-1012 Electrical Equipment…..it details all specs and settings for regulator and cutout adjustments. For the “generator purists” like myself it is the IH Bible of Electrical Systems.

Nj Farmer

User avatar
Dale Finch
10+ Years
10+ Years
Posts: 6605
Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '51 Cub #140966 "Bruno" with Woods 59 mower
'55 Cub #187541 "Betty" with Fast Hitch
'55 Cub #190482 "Ben" with Woods 42 mower
'55 Cub #191739 "Bertha" with Woods 42 mower
'56 Cub #194370 "Boris" with Mott Flail mower
Circle of Safety: Y
Location: NC, Chapel Hill

Re: Generator not charging

Postby Dale Finch » Fri Sep 22, 2023 1:17 pm

Dale Finch
Image
Circle of Safety


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Majestic-12 [Bot] and 2 guests