Posted by Ed Hotaling on January 21, 2012 at 13:05:26 from (67.240.55.230):
I have a 47 H. Converted to 12 volt 20 years ago with a Delco alternator and magneto ignition. 5 or 6 years ago, I rewired the tractor and added a key switch and solenoid to prevent my kid and her friends from accidently cranking the engine. (I can teach my own kid to stay off the tractor, but her friends might be another story.) This system worked fine until last week. I went to use the tractor and it acted like a dead battery. I jump started it, the alternator charged up the battery and I even got a warm restart. Next time, same thing. I checked the voltage at the battery and it was dropping to 5 or 6 volts with the key turned to crank. I had no problem replacing a 20 year old battery. Put in the new battery, same deal. I've had an issue with the starter before, so I replaced that. Yup, same deal. The solenoid would chatter, the battery would drop to 5 or 6 volts while trying to crank. Today I replaced the solenoid. I turned the key and the new solenoid chattered, the starter tried to crank and didn't let up until I pulled the ground wire off the battery. The only thing I didn't try was taking the key switch out of the circuit, but when I went to reconnect the battery, there was a spark and the starter tried to crank. Even without turning the key. Now the question; what do I do next?
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