Re: Regulator or Relay on 6 volt?
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Posted by Gerald on October 04, 1998 at 21:11:16:
In Reply to: Regulator or Relay on 6 volt? posted by Fritz Campbell on October 04, 1998 at 16:57:31:
: Do I have a regulator or relay on a 6 volt system on a recently purchased JD M 1948? I though I heard sometime ago here that a bad relay would drain the battery when sitting. Would a bad relay have anything to do with charging while running? I think I want to replace my whatever it is before I finish the rest of my restoration, local JD dealer says they are no longer available, any suggestions? Thanks for any help. At a minimum old 6 volt systems always had a reverse current cutout relay. That's one element of the voltage regulator if one is present. I don't know about the JD M. CT at 888-8CT-FARM shows something to fit the M for $27.99. Fits the MT alos. For more money they show a 6 volt reg. for A, M, 40, 420, 430, 320, 330, 440, 6, 70. For that they sant $36.49. Call them for a catalog. A relay will probably be round, just two terminals, nothing wired to the generator field. A regulator should be rectanguler about twice as long as wide or high and have a field terminal wired to a field terminal on the generator. A bad relay could drain the battery, or prevent charging. Even a good reverse current relay will take about 10 amps out of the battery when the engine speed is just below a charging speed. E.g. it takes about 10 amps reverse current to trip it out of the circuit. If I couldn't find one, I'd make a solid state regulator with a big silicon diode for a cutout and that would work much better. But I've done that a couple times already. The first was when I put a 12 volt beetle engine in a 6 volt beetle long about 1968. The lack of reverse current and the improved voltage regulation made batteries last much better. Alternators inherently use diodes for rectification and for automatic cutout at the same time.
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