1940's Farmall H - Replacing Light Switch

The dealer did not have a service update on how to wire the generator to function properly, i.e. high and low charge, only that they sometimes put a resistor in the generator circuit in line with the GEN F terminal. Does anyone have a service update or details on rewiring and splitting the generator circuit out from the original to operate with the replacement light switch?

I have a 6V system with a cutout. I have replaced all the wiring and had the generator rebuilt, and polarized, and cutout checked. I can obtain full generator output by "shorting" the Gen F terminal to the chassis, but I don't know what components and values the original switch had. (I have verifed the wiring with the stock H 6 volt generator w/cutout relay/distributor ignition and it matches, but the unit did charge with the old switch.)

Don't mistake the chargeing resistor with the coiled resistor wire at the top side of the switch, this is for the bright and dim lights.
The CIH dealer said the resistor or the original switch was no longer available. I bought a used one out of a salvage yard. The switches ought to be easy to come by but a good charging resistor may not be. Good luck

Figure $35 - $40 for a regulator. Wiring is straightforward (punch below for a diagram.) ...Bob M

• regulator wiring diagram

Thanks

Greg

Sounds like your H has the gen "F" terminal wired to the field resistor on the light switch. Instead the gen "F" terminal should connect to the "FLD" terminal at the regulator.

If you reconnect as above the generator should function properly - presuming the regulator is good of course.

If you put a regulator on it, you won't have to remember what charge level you want to be at. Less chance of over/under charging the battery.

Maybe C&G would have the right switch, 608-455-2411