300 Industrial tractor new findings

Wingerfl · Nov 11, 2019

Thanks to the great members of this forum, I have diagnosed and traced every wire and scenario regarding the tractor quitting. I found out this morning, by hooking an analog voltmeter to the + side of the coil and starting the engine, that it has 8 volts upon start up and then after it runs for maybe 20 - 30 seconds the voltage starts to climb and the engine starts misfiring. The voltage gets to between 12 and 14 volts and it burns the points and shuts off.

I disconnected the wire that runs from the "R" terminal on the solenoid, filed the points and started the engine again and it still does the same thing. The only wire attached to the coil + side is the resistance wire that comes from the IGN terminal of the ignition switch.

Could the resistance wire be bad causing this voltage rise?? Anything else I should look at?

Thanks again for all of your assistance!!

tomstractorsandtoys · Nov 13, 2019

First off I am very poor at electrical stuff. There really is not much wiring needed on that tractor. I would get a delco alt. with an internal regulater,a generic key switch,light switch and some wire and make a brand new wiring harness. Some Deere tractors used internal resistors and if yours does just get rid of that and wire it strait 12 volt. With old,cracked and patched wiring I find replacement better than adding more patches. I have rewired a few 1020-2020's and a good many 3020-4020's. Tom

300 Industrial tractor new findings

Wingerfl

New User

tomstractorsandtoys

Well-known Member

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