6v not charging

Mike from cny · Jul 5, 2009

Hey guys, Have a 56' JD 420c I'm trying to clean up and get ready for expo this week. Problem is it wont charge. It use to about 2-3 years ago. It has done this once before, but I had cleaned the grooves in the armature out and it worked good for a while. Last year, I installed a new regulator thinking that was it, but didnt change anything.

Yesterday I took the generator comepletely apart, armature was put in the lathe, cleaned up with a stone. Brushs have good tension, cleaned up posts and springs.

Touching "A" terminal and ground gives me close to 7 volts on the generator.

I've printed off John T's troubleshooting list but wont be able to try anything until tommorow night. Any help is appreciated. -Mike

John T · Jul 5, 2009

Those were originally Positive ground you know?? If its hooked up otherwise and you started it and the genny wasnt polarized same as battery you can damage a Voltage Regulator !!!!!!!! Id hook her up with battery Positive ground and Polarize the genny n then start her n see what happens (in case you havent already done it right that is)

A good working 6 volt genny should raise the battery voltage from its 6.3 volts sitting there to the 6.5 to 7 volts and a lil over range if shes charging. HOWEVER the open unloaded output of the genny dont tell you all that much, its what it can raise the batetry voltage to once coupled to it via the cutout relay inside the VR that matters. If shes not charging enough to pull the cutout relay in closed the voltage on its ARM to case represents the genny only NOT the battery voltage. (run my procedure to test the VR and cutout relay etc)

Working through my Troubleshooting Procedure, especially Para 5 where it tells how to see if its a genny or a VR problem and how to try dead grounding the field to see if that makes her charge or not ought to help you find the problem.......

John T
John Ts Troubleshooting Procedure

Mike from cny · Jul 6, 2009

I"ve never hooked up the battery backwards, however I"ve jumped it alot with a 12v battery, not sure if that would do it. Polarizing is done with the engine not running I take it? I"ll give it a shot tommorow night. Thanks for your help John.

Brian Jasper co. Ia · Jul 6, 2009

No, polarizing is done with the engine off. To polarize, you just momentarily short the BATT and ARM terminals together. Sometimes the ARM terminal is labeled GEN. All it takes is a momentary short.

6v not charging

Mike from cny

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John T

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Mike from cny

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Brian Jasper co. Ia

Well-known Member

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