Originally Posted by Sniper


You are correct, one terminal is the signal to the oil light. With the key on but the engine off it should ground and show the light as lit. Of the remaining two terminals, one should be hooked to switched 12v. The remaining terminal goes to the compensating resistor mentioned above and is only hot with good oil pressure. This is to prevent the choke from heating up with the key on but engine off.


I didn't realize this before but I just did this check and the oil light doesn't come on in the ON position! I've already ordered a new switch...

I think what happened is when my tranny went out last year I had it parked for months and some rats made a home of the engine bay and they chewed the wires. Before I had realized the damage caused by the rats I turned the ignition on and burnt a bunch of wires and that is when the oil pressure switch got fried!