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DogDiesel
08-10-2004, 14:56
Need help.
1993 Chevy Cummins conversion from 6.5TD.
Problem: Cannot find the oil pressure switch connecter. Was there when I installed the 5.9L but now it is a mystery. Can run my hand blindly behind tall Cummins head. Found three wires which do not go to anything else which come from the drivers side of firewall, but are solidly connected (or pinched) behind head.
Colors: 1. tan-yellow 2. orange 3. gray
Question: What are the colors for the three wires which go into the 6.5TD oil pressure/fuel pump SWITCH (located behind 6.5TD drivers side head)?

Wayne

Andy Chesek
08-10-2004, 15:03
On my '99 K2500, those are the colors of the 3 wires for the OPS.

HowieE
08-10-2004, 18:05
Orange is 12 volts from fuse, Gray is feed to fuel pump, Tan is oil pressure signal to ground through the switch.