1945 Farmall A generator/cutout

hayrake25 · Aug 22, 2010

Hello. I have a 1945 Farmall A and an not sure about the generator set up. There is a box on the rear fuel tank support. Is the a regulator or cut-out relay? Has Delco-Remy on it. Right now it has no battery on it. It should be 6V correct? THANKS ALL

gene bender · Aug 23, 2010

Dont know why its there as it is supposed to be on top of the generator. So lets get started off rite. There should be a plate on the engine side of your generator with a Delco Remy # and two threaded holes in the genthreaded so a saddle mount cut=out or a regulator to mount. Cut-out will have three terminals. One the side saying Batt and two on the other side saying F andGen with curved base. It is important to get the correct one for your generator as your gen should have three brushes with the third one being adjustable for the output. Thats why need to know what# on the gen.Over the yrs things get all messed up with parts being changed and then do you want original set-up.

teddy52food · Aug 23, 2010

A correction, Gene. A cut-out has 2 terminals & a regulator has 3 or 4.

JMOR · Aug 23, 2010

(quoted from post at 09:49:49 08/23/10) A correction, Gene. A cut-out has 2 terminals & a regulator has 3 or 4.

If you are going to "correct" someone, first be sure you are correct.......as in this case...NOT.
http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=718021

gene bender · Aug 23, 2010

I have 7 Aand B,BNs all have cutouts and there are three terminals BAT,GEN and Field even have a couple of gens that are ready to use with cut-outs. I have a new one in Delco Remy BOX 1116766 used on Delco Remy gen3 1101423 and 1101355. When replacing with a regulator you need the one for those gens as there is another reg to replace other 6v gens IH used. Just replaced a bad armature on an original tractor and it operates just like new again.

John T · Aug 23, 2010

I agree but I do NOT know any SN breaks for when (or if) they went from 2 (BAT GEN) terminal to 3 terminal (BAT GEN FLD) Cutout Relays. The real early cut outs used on tractors with no lights but a genny needed the extra 3rd FLD terminal to supply a field ground for genny charging, but much later when they started using lights they came up with the LHBD light switch to which the gennys FLD then wired, so there was no need for FLD on the cutout relay. However, it could still be used n work by just not using FLD on the relay.....

I bet someone can tell us which IHC used a 2 and which used a 3 terminal relay IFFFFFFFFFFFFFFFFFFFFFFF they ever even did that which I cant say for sure either as I have NO IHC specs or data, heck maybe 3 was allllllll they ever had but just ignored it with a LHBD switch????????????????????????????????????

John T

TractormanNC · Aug 23, 2010

I am backing JMOR and Gene on this one. Seems like I chimed in on the post that was referenced also.

Have a 1940 M S?N 11XXX that my grandfather bought new and has been in the family ever since. Originally had starter, battery, generator and NO lights or even the 4 position light switch. The cutout had THREE terminals as said. The resistor that is on the 4 position light switch is connected to the third terminal inside the cutout and the field terminal of the generator was connected to this third terminal (F) to give permanent LOW charge.

The way these old tractors were intended to be run was to crank up early in the morning and not shut down until lunch time or maybe even dark. The low charge rate was plenty to keep the battery up under these conditions.

gene bender · Aug 23, 2010

I have never seen nothing but the three terminal cut-outs on any I-H. AC did use them. Even early Cs had the cutouts befor they went to a reg. You can get the two post cut-outs as i see them listed in parts books but the Delco Remys were used for many yrs.

Greenie727 · Aug 23, 2010

I have also only seen 3 terminal cutouts on any early IHC tractor. The Ford Model A auto used a 6 volt two terminal cutout. The adjustable 3rd brush tapped power from the commutator and supplied the field coils which were INTERNALLY grounded inside the generator case. There was no reason for the third or F terminal on the Model A generator or cutout as the output was fixed depending on the position of the third brush. As John stated however the addition of lighting on the tractors allowed the operator to select high or low charge by varying the field resistance EXTERNALLY of the generator by using the lighting switch or fixed at high output by grounding the wire off the F terminal of the generator under the cutout mounting screw direct to ground. The high output could still be adjusted on the tractor generator by moving the 3rd brush but the external ground allowed two different charge rates. Just my two cents as my 1931 Ford Model A uses the two terminal 6 volt cutout.

1945 Farmall A generator/cutout

hayrake25

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gene bender

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teddy52food

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JMOR

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gene bender

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John T

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TractormanNC

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gene bender

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Greenie727

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