Another Ammeter Question

Disconnect the battery and with the cover off the regulator, inspect the inside and check for any water intrusion, corrosion etc. Determine which relay is the field relay. There are two relays, one for the field winding and the other for the armature cutout. Check the contacts on the relays for pitting etc. Clean the contacts by closing the contacts onto a business card and dragging the business card thru the closed contacts to clean them. Get an ohmmeter and check the windings for continuity. If the the contacts are good and windings are good, then the regulator should function, or maybe need an adjustment. Reconnect the battery and start the tractor and note the operation of the relays. You can change the setpoint for the field relay by reforming (bending) the relay spring mount and the relay stops. Another item to note. The voltage regulator is mounted onto flexible rubber strips. This is done to eliminate shock and vibration to the regulator. Make sure your regulator, when installed, is free to mechanically float.

Paul in NJ
1951 Cub
54A Blade
Woods 42
Cub - 22
 
Thanks Paul. Is there a set clearance on the points on the VR? I'll take it apart today.

Bus Driver,

The number you posted for Bob is a NH number, so it's close...I'll post the number of the GEN
 
Did it ever charge with the new VR 7 months ago? If it did charge was the amp needle far to the right? When you grounded the field terminal did the amp guage move far to the right or just a small amount? Two or three brush generator? Correct "A" circuit regulator?


It seems unlikely that two VR would fail but is certainly possible. Take off the cover and do an autopsy as Paul suggested. The cutout relay will be the one infront of the battery terminal. The other one or two are the ones you want to look at. Check the points and look for burned windings. Post pictures if you can.
 
Landreo":16e6k1qg said:
Did it ever charge with the new VR 7 months ago? If it did charge was the amp needle far to the right? When you grounded the field terminal did the amp guage move far to the right or just a small amount? Two or three brush generator? Correct "A" circuit regulator?


It seems unlikely that two VR would fail but is certainly possible. Take off the cover and do an autopsy as Paul suggested. The cutout relay will be the one infront of the battery terminal. The other one or two are the ones you want to look at. Check the points and look for burned windings. Post pictures if you can.
Click to expand...

When I bought the Cub 7 months ago, I assumed it was charging, but I honestly do not know. Once I started visiting this site, is when I started learning and checking all the systems.

When I ground the F terminal, the ammeter definitely moves far to the right, not a little movement.

I'm not sure if it is a two or three brush generator. I'll post the numbers hopefully tonight. What's a "A" circuit regulator?

I'll try to post pics later...

Thanks,
 
If the generator has weak output it may not move the needle enough for you to notice or if the ampmeter is not reading correctly it may seem as if there is no charge when there really is a small charge. . If you have a distributer and not a magneto, loosen the neg battery terminal, start the tractor, make sure the light switch is off, remove the negative terminal, if the engine keeps running then it is charging some, if not then time to take off the top of the regulator for an autopsy. Do not run the engine for more than a few seconds with the battery disconnected. On a 3rd brush generator the field current can get very high. A few seconds will not hurt the generator but longer may overheat the field windings.

The cub uses an "A" circuit VR that grounds the field terminal to increase the output, a Ford "B" circuit does the opposite. I would think if it worked for a while then it is the correct VR.
I doubt you will find a point gap listing for your VR, if cleaning the points fixes the charging then just check the output voltage and you are done. However, if the points are corroded then you may be back in the same situation shortly.
 
Here are the generator numbers;

Re manufactured in USA
Delco 6V
P/N: 103821A1R
WO #: 126783
SN #: 80066

DC R26 DH580
 
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