there are three wires to the solinoid , pull is only hot while the engine is turning over to start , hold gets hot after the oil pressure gets up , and ground , the oldest series took voltage for the pull from the armature lug of the solinoid of the starter , some have a seperate timer relay mounted on the rear door frame , newer models has the voltage sent from the controller , new series also have a section of wiring harness which plugs in between the solinoid and the harness , it has a fuse holder and a device called a timer , it could be alot of different things that could cause your problem ---------------------- you could take a choke or lawn mower throttle cable , mount it in the cab , disconnect the solinoid and attach the end the cable to the stop arm , pull to kill , push to stop 15 minute job and you'll never have to worry about it again -- the machine will lose it's abillity to shut it's self down on it's own , but the alarm would still go off alert you of a temp or pressure problem