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Elect Question for Gerald J John T

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J Davis

11-17-1999 03:43:18




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I am a believer in leaving the old 6 volt systems in place on the early JD's. One option I had not considered was an 8 volt battery...to tell the truth I didn't even know they were so readily available. I understand that the extra 2 volts will not do any damage to the electrical system and the light bulbs are already rated up to 8 volts and will burn out marginally quicker than on 6 volts. My question is if the old generators have enough omph to keep the 8 volt battery charged? Any thoughts from the Electrical Wizards of Greenlo Park?

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John T

11-17-1999 06:28:56




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 Re: Elect Question for Gerald J John T in reply to J Davis, 11-17-1999 03:43:18  
Mr. Davis, In my opinion, the existing 6 volt generator (if in good shape with good brushes and commutator) would have no problem charging if you installed an 8 volt battery and you have a compitent old fashion generator shop nearby that can adjust/modify or maybe even change out the voltage regulator. I have seen some farmers just install the battery and do nothing else but if I recall their batteries didn't stay charged well. If you had a three brush generator (I dont think you do) then a generator shop may adjust the location of the third brush and/or possibly the external field regulating resistors value. Given a fixed armature, the ways to increase a generators output (they dont know what voltage they are) are to increse the field current or turn them faster. So, about the only change is a small increase in field current, and the existing field coils can likely stand a small current increase with no or only marginal degradation. As you know, I have made 6 volters into 12 by changing a regulator and never had one go bad yet, although a real generator shop would probably do it by changing the field coils. Potential voltage output (provided more field current) can also be increased by more armature segments, but thats another story. The other thing you may need to worry about is addition of some ballast resistance in the coils primary circuit (if you dont have a mag) to drop 2 volts so the coil receives 6, but post back as thats another story. I have seen Kens postings on here who I think is a real generator repairman who may be able to help with particulars or hardware. Although as an engineer and long experienced generator repairer myself I can answer these questiosn in theory, I am no actual generator shop nor can I adjust regulators like a real old fashion generator tech can. Good luck, I dont see any problem using the old generator. John T, Ol Engineer in Indiana

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