Anonymous-0
Well-known Member
Anyone know where I can purchase a cotout relay for a 1943 Farmall H? It has three terminals on it, BATT on one side and FIELD & ARM on the other side.
Thanks!
Thanks!
- Thread starter Anonymous-0
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Anonymous-0
Well-known Member
It has a Delco generator on it but I can not read the numbers on the tag. I took the cover off of the regulator and it only has one relay in it so I take it that it is just a cutout relay.
Thanks!
Thanks!
Anonymous-0
Well-known Member
You are correct in that it is a cutout only. The field terminal was used only for tractors that did not have lights so they had no high, low charge switch. When you hooked up the field wire to that terminal you had permanent low charge. You should be able to find plain cut out at an auto store. CaseIH may try to sell you a voltage reglator and then you would just use the cutout portion of it, waste of lot of money.
rustyfarmall
Well-known Member
Correct. Just one relay indicates a cutout. I doubt if you will find a new one for a Farmall, although they do exist for John Deeres, which would probably work, but they don't have the same outward appearance. Might be easier and less costly to convert to a 6 volt, positive ground voltage regulator.
TractormanNC
Member
Agree with BobM, use a voltage regulator instead of the cutout. NAPA has some that have a curved bracket to mount on top of the generator just like the cutout. Keep your mouth shut and the hood on and the "correct police" will never know.
Jim Becker
Well-known Member
I decided a while back that the next time I had a bad cut-out, I'd try gutting it and installing a diode. Haven't had one go bad yet to see how it will work.
Janicholson
Well-known Member
Jim Becker's Idea is a good one. A big diode from an alternator trio can be scavenged and placed between the Bat and Arm terminals in place of the cutout relay mechanism. Just remove the internal components. and keep the terminals insulated from ground.
Use the diode hooked up so that a test light will not light when one end of the diode is hooked to the Negative ground, and the other lead (or mount) is touched with the light probe. You can do this at the battery negative post. Just switch ends if it lights up, and remember to attach it in the old housing so the ARM terminal is connected to the same end that did not light up the test lamp.
If your tractor has a 4 position light switch that is connected to the F terminal, it should work like normal. The F terminal on the cutout will still not be used. If the F terminal was used (going to the F terminal on the gen) and you are happy with the charge rate, do not destroy the resistor or connection to the F terminal on the old Cutout housing. Good luck, JimN
Use the diode hooked up so that a test light will not light when one end of the diode is hooked to the Negative ground, and the other lead (or mount) is touched with the light probe. You can do this at the battery negative post. Just switch ends if it lights up, and remember to attach it in the old housing so the ARM terminal is connected to the same end that did not light up the test lamp.
If your tractor has a 4 position light switch that is connected to the F terminal, it should work like normal. The F terminal on the cutout will still not be used. If the F terminal was used (going to the F terminal on the gen) and you are happy with the charge rate, do not destroy the resistor or connection to the F terminal on the old Cutout housing. Good luck, JimN
Anonymous-0
Well-known Member
I like the idea of a diode, if you go to a voltage regulator we are in the situation we were discussing a few days ago about excess current flow through the points on the reglator as the generator that originally used a cut out and high low charge on light switch has a field coil draw of 3.5 to 4.5 amps where as the generator using a voltage regulator has 2.5 to 2.7 amp draw. Points in regulator do not handle the higher amperage well causing eratic regulation and short reglator life. My opinion. You could also just find an old regulator and use only the cutout portion of it as they are usually in good shape.
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