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Farmall 300 help again

F

farmallmaniac

Member
Hey guys I have finally found some time to look at my 300 that lost all
Power. I couldn't get power to the voltage regulator until I disconnected the wire that feeds it and there was a second wire under the same screw that fed the alternator. I reconnected it and the tractor started. I shut it down and almost right away unnoticed some smoke coming from the key cylinder. That might have been from the dash being torn apart and the cylinder was touching the sheet metal? Now once again I don't have power leaving the regulator. Could that be bad and just misbehaving?
 
Smoke coming from the ignition switch is an indication that there is high resistance between the contacts inside the switch.

That could also cause the loss of power.

If you are sure you replaced the wiring correctly, and nothing is shorted, probably time for a new ignition switch.

If you have a test light or volt meter, turn the ignition switch on, test the power coming to the switch (BAT) and the power leaving (IGN). Both should read battery voltage to ground.

Also look at the wiring on the back of the switch. Sometimes a failed switch will overheat the connections. If it is a plug on harness type, and it has been hot, the connectors will need to be replaced, or the new switch will overheat and fail again.
 
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