Mr1970fj40

The wiring issue got fixed, there was a broken stud on the alternator that someone ‘fixed’ by connecting a jumper wire to a hot cable we fixed the stud and removed that wire and now ignition, dash, and pump works as it should.

Thank you, I’ll have dad take a look at that area you were saying and see if that’s the issue, I’m away from the truck for work and just trying to wrap my head around what could be the issue. will keep you guys updated, thanks again

Hey all, so I just recently purchased a 1991 W250 12v (non inter-cooled). It has the worse electrical gremlins a guy could ask for. My issue with the truck is there is constant power to the dash and to the ve pump, even with the key off and also with the entire ignition switch taken out. The truck will start with the key but won’t turn off with the key since there is constant power to the pump, the plunger stays open so I have to use the kill lever. My old man and I have tried looking for a short and don’t have any luck. Replaced the voltage regulator and alternator thinking that was the issue but still constant power to dash and pump. Anyone else encounter these problems?