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super c not charging

H

henryv11

Member
I need a little advice. I Am working on a SC it will not charge. The first thing I did was clean the commutator the brushes look almost new. Then I could make it charge by grounding the Field. It put out almost 8.2 volts. I took the cover off the VR the C/O contact would pull in ok. the other contact(top) would not. If I put my screwdriver next to the solid contact and touch the moveable one it pulls in and charges(as long as I hold the screwdriver there). I ran a separate ground wire to the VR case to make sure it was grounded. I bought a new VR and it makes no difference. I don't know what I Am missing.It has a 8V battery if that would make a difference)I usually have pretty good luck getting the older systems to work
Thank You
 
The compromise with an 8v system includes the fact that the gen needs to be making more volts than the battery. Some where around 8.4 volts or more. The cutout relies on this differential to latch, or unlatch. Were it mine (and a SC which spins over well with 6v I would go back to 6v.
Reducing the force that pulls the cutout closed (reduce spring pressure) will go in the right direction, but it must be done in very small steps to assure it will also unlatch when about 2 amps discharge happens. Good luck. Jim
 
I know about a couple oF Cs using 8v batts didn't change anything and they have been that way for sometime. When you ground the field and it charges that means the reg is not working is the reg made for your gen. Is the reg mounted under the gen. Where did the reg come from as it does need to be for the gen and not just a reg off the shelf. What is the Delco Remys tag say and are you using positive ground.
 
Taking the metal cover off the VR might affect its magnetic field and change its parameters. In a correct voltage properly working VR the cutout relay doesn't latch and hold in until the gennys output sufficiently exceeds battery voltage which would be at least around 6.4 or more on a 6 volt system or around 8.5 or more on a 8 volt system. 8.2 volts will NOT charge an 8.4 volt battery !!!! When you dead ground the gennys FLD post you effectively take the VR's regulation out of the circuit and puts the genny in max charge condition. If you then manually close the cutout relay it might (subject to RPM and battery and genny condition) charge to some degree but that's NOT any ideal situation. I've seen 6 volt gennys charge 8 volt batteries (though not many amps) work better when there wasn't any VR just a cutout relay and a manual Low/High charge control. For all these reasons plus premature points life and bulbs Im NOT a fan of 8 volts on old 6 volt tractors even if it can "work" to some degree. Id rather fix the 6 volt system with a good genny good battery and 00 Gauge battery cables.

John T
 
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