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Anonymous-0

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I bought my tractor a couple of years ago. The tractor had been converted to a 12 volt system when I got it. The alternator was not hooked up. I ran it that way for a long time and just charged the battery as needed. When we wired the alternator in, the battery acid came out of the battery. I had the alternator checked out and was told the inside looked like it had been too hot. I put the alternator back on the tractor and started it- the needle on the gauge was to the far right and then when I went to stop the tractor by pushing in the switch, the tractor continued to run and I had to cut the fuel off. Is it possible that the 12 volt conversion was done improperly so that it is causing the problems with the alternator and is the switch a separate problem or related? Thanks
 
The conversion was not done properly. That's probably why the alternator wasn't hooked up when you got the tractor.

What you need to do is start over from scratch and do it right.

The reason the tractor keeps running is because there is no diode in the excite wire that runs from the ignition switch to the small plug on the alternator. When you turn off the switch, the alternator backfeeds electricity through the excite wire to the coil wire, and keeps the tractor running.

That missing diode may also be the reason you're overcharging and boiling the battery over.

Still, I would rip all the wiring off and start over.
 
Are you sure the battery is hooked up negative ground? If the PO just swapped batteries he may have left it positive ground not knowing the starter works either way.

Charging the battery backwards is about the only thing that will blow the acid out and burn up the generator in short order. That would also account for the high charge rate.
 
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