Tom
Administrator
- Joined
- Jan 13, 2005
- Posts
- 51,854
During our last trip I noticed that the oil pressure gauge on the coach was pegged hard over, although Silverleaf was reading a valid oil pressure from the diagnostic connector. See this discussion. Yesterday I finally got around to trying a replacement gauge; It wasn't an identical one, but I figured worst case it might need a sender with a different resistance and would read something when hooked to the original sender. I also picked up the correct sender for the new gauge.
On removing the old gauge, it was physically stuck at something over 100 psi (full scale is 120 psi), although I'd confirmed before removing it that it's pegged against the stop with the engine running. After hooking up the new gauge with the original OEM sender, the new gauge didn't read anything.
I was about to replace the sender when I realized that the OEM one has two wires on posts, whereas the new one (and the others I'd seen at a couple of auto parts stores) had only one. I can't read the schematics in my owners manual because they've been shrunk too much, but I'm guessing that maybe one wire goes to the ECM and the other goes to the gauge on the dash. Does this sound right? If so, does anyone know if I could just switch the wires at the sender, or would the ECM shut the engine down because it would now be reading "incorrect" oil pressure?
Looks like I might just need to buy a new gauge and a new sender from a Cummins dealer or Monaco (?), although I'm having a tough time believing they both went out at the same time.
TIA.
On removing the old gauge, it was physically stuck at something over 100 psi (full scale is 120 psi), although I'd confirmed before removing it that it's pegged against the stop with the engine running. After hooking up the new gauge with the original OEM sender, the new gauge didn't read anything.
I was about to replace the sender when I realized that the OEM one has two wires on posts, whereas the new one (and the others I'd seen at a couple of auto parts stores) had only one. I can't read the schematics in my owners manual because they've been shrunk too much, but I'm guessing that maybe one wire goes to the ECM and the other goes to the gauge on the dash. Does this sound right? If so, does anyone know if I could just switch the wires at the sender, or would the ECM shut the engine down because it would now be reading "incorrect" oil pressure?
Looks like I might just need to buy a new gauge and a new sender from a Cummins dealer or Monaco (?), although I'm having a tough time believing they both went out at the same time.
TIA.