LugNut90210
New Member
First post here We have a 2005 Peterbilt 335 water truck with a Cummins engine. The engine fan clutch runs all the time no matter what. When I put my meter on the two pin connector going to the air fan control solenoid I get 10.88 volts. Ground wire checks out good when checking continuity to chassis ground. If I jump 12 volts to the control solenoid the fan clutch disengages like it’s supposed to. We have replaced the ECM, fan control solenoid, and the fan clutch itself. Having trouble finding a good wiring schematic other than what Diesel Laptops provided me with. Any thoughts or input is appreciated… thanks.