Farmall Cub

Joe Kimbriel · Mar 7, 2021

I'm stumped,, I have replaced the regulator for the third time and for some reason the regulator fails after a day or so. When first installed it works perfectly, lights on, lights off, regulator picks up load no problem. When it fails amp shows -2 amps lights on - 8 amps, never picks up load again. I can ground the field and the gen produces up to 15 amps, so gen is producing. Why is my baby Cub blowing new regulators?
Thanks,
Joe

glennster · Mar 8, 2021

my 49 cub is doing the same thing it would eat a regulator a year. last year i replaced the regulator again, it charged for a few days, then it pegged the ammeter needle and quit charging. grounding the field will not get it to charge. i king of think something in the generator is at fault. i talked to a starter shop and i need to drop the gen and a couple of bad v regs for them to look at.

Joe Kimbriel · Mar 8, 2021

Which way did the Ammeter peg? If it was in negative direction, definitely a short to ground somewhere. My ammeter is good for +30 to -30 and the gen will only puts out maybe +15. I can burnish the regulator contacts and make the it work for a few more minuets, then it craps out again. I'm going to try another gen and see what happens. There's got to be some good reason for this, please let me know what you find.
Thanks,
Joe

John M · Mar 8, 2021

Cheap Chinese regulators.

glennster · Mar 8, 2021

mine pegged to full charge i would guess 20 amps or so, it wasnt designed to put out that much.

Joe Kimbriel · Mar 8, 2021

Bummer, I bought them from YT. I should crack out the original and try it. The only reason I replaced it was because it was all rusted and not pretty for my restoration.

John M · Mar 9, 2021

I dont know who YT gets their parts from, but most every regulator Ive bought in the last, oh 20 years, has come from China, no matter what brand. I was havng issues with my Cub charging. Buddy had a regulator, brand new, straight from John Deere, way overpriced IMO, but I borrowed it. It worked just fine for an hour or so, and then it went out. Adjusted till my eyes popped out and couldnt ever get it to charge right. Paid my buddy for it sine I may have messed it up, took the genny off and put a Hitachi alternator on it and never looked back.

Janicholson · Mar 9, 2021

If the field windings ground internally, it can produce heavy magnetism from the shorter number of windings in the circuit being driven by the output voltage. Then the winding burns out, and it quits. Jim

BarnyardEngineering · Mar 9, 2021

You might be able to take a "pretty" cover from one of the bad new ones and install it on the original regulator...

Joe Kimbriel · Mar 9, 2021

Not a bad idea, but if the old one works I don't care about pretty anymore.

Farmall Cub

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