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Finally got her charging...Sorta

F

Fullers Farmalls

Member
Took the genny off for closer inspection and found that the field terminal wire was broke off. So i fixed er up and she showed charge. I know its not perfect cause the charge was bouncing between plus 3 and plus 10 amps at full throttle. Then when i would jump a wire from the field terminal to a solid ground it would jump to around 20. Is this normal or should i be looking for something else?
And a special thanks to Jim and John T, you guys really helped me so THANKS! -Keith
 
Have you tried tightening the belt by adjusting the pully on the generator. If you loosen the set screw on the pulley, you can then tighten or loosen the pulley sections to adjust belt tightness.
 
I think i have it tight, about half inch deflection when i press on it with my thumb. I'm not sure what the correct tension is, but it is charging after a long battle haha.
 
Belt needs to be pretty tight. Hard to tell by just half inch deflection because the force you're pressing with can vary so much. With the needle bouncing as you describe, that is a classic symptom of a belt not tight.
 
Keith - If it charges +20 amps with the "F" terminal grounded, the belt is plenty tight (ie. not slipping).

Now if the battery is fully charged, ammeter bouncing between +3 and +10 is not unusual - it's just the ammeter responding to the rapid cycling of the voltage regulating element (relay) inside the voltage regulator.

Now if the battery is less than fully charged (ie immediately after startup) the ammeter should show steady +15 to +20 amps at full throttle. It should continue charging like this until the battery reaches full charge where it will taper back to your +3 to +10 "bouncing".

However the ammeter bounces +3 to +10 with the battery less than fully charged, the problem a failing voltage regulator.
 
If it is running into a pretty full battery that jumping as pretty normal. The dampening material in old gauges is usually not operational, and they will dance. The charge voltage (with an analog meter, or very good digital MM should be at 7 to 7.2 volts. All is well!!! I think. Jim
 
If the generator is turning the belt is tight enough. These old geny's have bushings not bearings. If you over tighten the belt the bushings will wear out really fast.
 
I'd say your ok. Just for peace of mind you might want to run the wires to the regulator just to see if you have a bad spot in the insulation where it could be intermittently grounding. What does the ammeter read when you have everything turned off?
I have seen those old meters get out of calibration and read all over the place on a full battery. IT could actually be cycling from positive to negative slightly and if the dampener is bad that could be highly exaggerated. But I am also a believer in the smoke test. If it's charging and keeping up with the load and it isn't SMOKING, then you should be ok. LarryT
 
That 20 amps with a dead grounded field sounds like the genny is fine. As far as a jumpy needle (if excess) , that can be due to several things such as: Loose brush hold down springys,,,,,,too short brushes,,,,a dirty oily or rough or not properly undercut commutator,,,,,,,,,burned or carboned relay contacts in the voltage regulator,,,,,,,, a loose connection especially a bad loose ground somewhere,,,,,,,,a faulty ammeter.

Id be tempted to clean n polish up the gennys commutator and maybe run a dollar bill between the VR"s relay contacts to clean them and check n clean the grounds n wiring connections

Thanks for teh feedback

John T
 
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