Pump guy i looked up the manual for this unit hard to read the schematic ,the poster is pretty sure it is an oil pressure switch but i think all it is doing is turning on the hr meter as he has jumped it together and it still dies , alternator is the broken belt sensor , but in the trouble shooting that travis said in post 26 the lincoln manual also states high oil temp will do it also as cmark stated in post 23 , so yeah I almost bet if he threw a solonoid at iit it is going to do the same thing unless he finds the oil temp or over temp switch and bypass it to eliminate the last part of the safety shutdown system for testing purposes only