My C wouldn"t charge the battery on "high charge" so I adjusted and cleaned the contacts in the voltage regulator. Now it charges on high and stays there-amp meter shows +10 all the time. If I open the contacts on the voltage regulator it goes to 0 or -10. Looking at the poor diagram I have I don"t see how it would charge at a low rate. Doe"s anyone have a wiring/charging diagram for a C with voltage regulator and battery ignition? Or does anyone know what allows charging on a "low" rate.
Thanks
Dave

If your battery is not fully charged,the 10 amps is not out of line--could take an hour to bring the batt. up to full charge.
On the other hand, if the batt. is known to be fully charged, you can adjust the "vibrating" field contact to lower the voltage/ current to a safe level. 6.8 to 7 volts will be O.K.--measured at the battery.

Battery may have a weak cell & it will keep charging at the high rate.

The issue is complex but very fixable. There is a direct conflict between two control systems. The tractor charging system was first designed with a operator controlled charge rate consisting of the light switch as a controller. (The lights were not part of this control, just hooked to the same switch shaft) The L low and H high positions, as well as D and B positions, affect the generator output by grounding the field terminal of the gen. (It gets its voltage from the third brush, or the Arm terminal in a two brush) the L position runs the field current through a wire resistor on light switch. In all other switch positions the grounding is direct, allowing full field and max charge.
Your tractor now has a voltage regulator on it. This is in direct conflict with the switch for control of output.
If originality is desired, and the switch is used, the VR must be removed and the F wire must go to the light switch. (the resistor on the light switch must be good as well, there are two resistors one for dim lights and one for low charge)
Better regulation, and battery life can be had with the VR, and then the wire from the light switch must be disconnected. (both ends)
This allows the gen to be regulated correctly by the VR. (assumes a good Grounded VR) I would do this and abandon the switch. Jim
Diagrams and system check process from Bob M

and John T

You didnt say which regulator you have is it mounted on the gen or below the ben. Early Cs had the cut-out on top of the gen and a movable third brush. Later they went to a mount below the gen with a reg. The regulator is different from a saddle mount to the one mounting at the bottom of the reg and the hooking up the regs does vary didnt yours come with instructions. I have worked on both types and always used the correct regulators. My mowing tractor uses the reg mounted below the gen and does use the wire from the field going to the lite sw.

I am going to be careful to saaure the board that the use of a regulator and the light switch at the same time (both connected to the F terminal of the Gen.) is not operational and should not be that way. There are certainly old style cutout relays (one internal coil) that look just like a regulator. Some even have a F terminal when they are used with a tractor that has electric start, and no lights, they were used to apply low charge only all the time. They were equipped with a resistor for the field to ground through.) If your application has more than one coil unit it is a regulator. It needs no connection to the light switch from the F terminal. Jim

I have one reg i bought long time ago that still hooked to the lite sw the res on the bottom of the lite sw. Over the yrs thing change ive only been working with these charging systems for 50 pluss yrs Still have the first B i bought in 1960. Probably have bought and sold20 or so still have 10. Once in a while i even runacrossones that are still original and working.

I have a new 6V battery installed and the voltage regulator is mounted below the generator. Still haven't found a wiring diagram or schematic. This has a three position light switch and is all origional as far as I can see. Thanks for the replies. David

Seems to be some confusion here. First the best diagrams are in the operators manual. Second, with a voltage regulator and a 3 position switch there is no high charge, only off, dim, bright. However, you can have a 3 position switch and an adjustable third brush. Operators manual says how to adjust the brush, you don't want to move it in too close, though. I may be missing something in your question and the replies.

I was confused in my answer. I made a jump to the conclusion that you had a 4 position light switch.
The low charge operation of a voltage regulator is produced from two interconnected elements. The first is that the voltage control points on the voltage relay (not the cutout relay) vibrate into contact and out of contact as the voltage setting is reached. It does not go to a condition of "Low charge" it tapers to less and less charge as the battery fills. The voltage remains at 7.2 or so and the amps go down proportional to the state of charge in the battery with constant voltage. Easy to fill lots of amps when the battery is low, and more difficult to fill when near full.
The secong element is a wire wound resistor (usually under the base to allow heat dissipation) that causes a continuation of charge rate even if the contacts in the voltage relay were open, and while they are open as they vibrate. The cutout is responsible for connecting the gen to the battery when the gen puts out enough to charge the battery, and disconnects it automatically when the gen does not meet this requirement, As when shut off. If it does not disconnect the gen, battery current will back flow into it and let the battery drain, and the gen to overheat.
Connections: Find attached the diagrams!
The gen F terminal is attached to the Reg Field terminal (12 gauge wire no other connections)
The Gen terminal (could say Arm) on the gen connects to the Arm terminal on the Reg with 10 gauge wire (no other connections). The Bat connection on the Reg connects to the Amp gauge load side (the side not connected to the Starter switch.)
If it has a L terminal it connects to the Light switch fuse supply terminal.
Jim
Bob M fine wiring diagrams

Thanks Jim. Your 8:07 answer is what I needed I think. Will work on it this afternoon.

Dave