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Re: Charging system for Farmall H
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Posted by John T on February 16, 1999 at 12:12:48:
In Reply to: Charging system for Farmall H posted by Kent Smith on February 16, 1999 at 10:04:02:
Kent, Its been several years since I owned M's and H's, but I may be able to help if memory serves me correct. Im not sure, but think that tractor has a simple generator cutout as opposed to any real voltage regulator. The way older IHC's regulated their charge rate was with that rotating ignition switch setting (inside that oval shaped wiring/gauge box) that had low and high charge rate settings. (Old timers called em 2 speed generators) That switch inserts different resistances in series with the generator's field coils thereby adjusting the charge rate as high (H on switch) or low (L on switch). So, if you're sure the generator is good but you're not charging, I say its a bad rotating switch assembly or one or both of those internal wire wound resistors is burned up and open. The wiring in that oval gauge box is messy and tricky, but that rotary switch if working inserts a different resistor in the wires leading down to the generator depending if set to L or H. Also, even if the generator itself is good, that cut out relay (small rectangular metal box on generator)can be bad and never close allowing the generators output to reach the ammeter terminal. You need to verify if the generator is really genning, and if so, if the cutout is closing which connects it to ammeter (it disconnects to keep battery from discharging through generator when tractor shut off). Note, even if those field regulating resistors in the switchbox are burned completely open, the residual magnetism in the field coils would allow a small charge current out of the generator, but it would be insufficient to maintain the battery. What I'm sayin is, the generator itself can be good if tested at a shop, but if those resistors in that box are open or that switch is bad, youre not gonna get enough charge to keep the batteries up. Those old two speed IHC generators and rotary switches can be a headache but maybe this theory can help you track down the culprit. My guess (if you insist generator is good) is a bad cut out relay or bad rotary switch. Let us all know how you come out. John T in Indiana, more of a JD man.
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