Help with electrical diagnosis
Well this isn't for my Ranger... it's for my little brother's 91 S10 with a 2.8L V6.
He was driving it down the road one day and hit a bump of some sort and the damn thing just died. Since then, we've replaced the fuel filter, fuel pump, and ECM. I've confirmed that the fuel pump works, and that fuel is getting to the engine. When I run 12v straight to the pump, the pump will run and pump. The engine will run when I directly power the fuel pump. When I jump the 12v power at the fuel pump relay, however, the pump doesn't run. I'm not getting 12v from the "battery" terminal on the relay it seems.
The 12v "battery" terminal also runs to the oil pressure switch. When I was looking under there, I saw that the oil pressure switch wires had fallen on the exhaust and gotten burned. I patched them in, but I am still not getting power to the fuel pump relay. On the dash, the fuel pressure gauge is flashing (it has digital gauges) but it still seems to build oil pressure while the motor is cranking.
Do any of you have any ideas? I may try to get a new oil pressure switch tomorrow, but I'm out of ideas. I don't think that the relay is bad, but I will get a new one tomorrow to be sure. Even then, when I jump the power and "bypass" the relay, the pump runs. Please help me out!
2003 FX4 Level II. Twin Shifters. Black. A few mods here and there.
Originally Posted by SuperGildo@RRP
Kyle's a smart man.