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Dying gator from radiator fan and lights
The 12V supply for both the cooling fan and the fuel shut off solenoid come from F6 in the fuse panel thru the yellow wire out of the ignition switch. It is possible there is a voltage drop thru the switch that momentarily disables the voltage to the shut off solenoid when the fan relay is pulled. A good check would be to connect your voltage meter to the yellow wire coming out of the switch, run the motor until the fan comes on and check for a voltage drop. It would also work on the red wire to the shut off solenoid, which is the hold voltage that keeps the solenoid pulled. I don't know where the cab light light voltage comes from, you could check that out.
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Dying gator from radiator fan and lights
There could be a bad connection in the ign. switch that would cause a drop. Also the plug in the back of the ign. switch could be dirty. It's always a good idea to check and clean all the ground connections. I'm sure there is a ground connection on the motor with 3 or 4 wires somewhere. The red wire in the fuel shut off harness plug is the hold voltage, so any momentary drop would probably let the solenoid go. Check and clean the connections in that plug. It could also be the solenoid going bad. Once you started it you could jump a hot wire to the red in the solenoid plug. That would assure hold voltage to the solenoid. If the fan comes on and the motor doesn't die you would know it wasn't the solenoid. It would be a voltage drop somewhere before that. You would have to take the jumper wire out to shut the motor off.
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Dying gator from radiator fan and lights
Let's try jumpering the ground wire out of the solenoid plug to the battery. The 3 wires in there are: white/pull voltage, red/hold voltage and black/ground. The white wire is not involved after innitial pull. Did you clean the ground lugs on the motor? Right now I can't think of anything else electrical that would shut the motor off.
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Dying gator from radiator fan and lights
Another thought, there should be a ground from the motor to the frame, it's usually on the left rear of the motor on 6x4s, don't know about yours. Try a battery jumper cable from battery negative to a point on the frame.
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06-06-2010, 22:11 
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