BackHead - WH
Groove - PV8
Leadwire - 3 wire FORD OEM Plug
The problem that I cannot find the wiriing diagram for the 3 wire FORD OEM plug.
The Colors are brown, black, white
brown and white going to the front, guessing the clutch.
black and white going to the rear of the compressor.
all 3 colors go to this plug. What colors go to what????
Here's my guess...
white is ground
brown to binary switch
black to Ign switch
thanks for your time
you coulkd probably get an answer if you let us know what year and model Ford you're working on
From my research it was for a Ford Sterling HD Truck with a Cummins ISB engine. Year unknown.
Simply test the engine side of the connector using a mulitmeter to determine the power supply/ground. The switch in the rear of the compressor is a High Pressure Cut Out switch. This switch is normally closed and interrupts the ground side of the wiring circuit.
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If you don't actually have the big truck because you're using this compressor in some custom job-- it should work to connect the black to ground, brown to the power circuit that turns the compressor on, and leave the white as an internal connection, no need to connect it to the vehicle system at all.
The clutch coil on the front should measure 3 or 4 ohms, and the switch on the back would be closed if the pressure is OK, open if it is not.
Yes this is a Mutt parts Cummins 4bt job. Going to ohm this thing out now.
ok the clutch ohmed out to 4 ohms.
Connected POS to BROWN and Gnd to BLACK and I could see the cluch engaging.
So I guess everything works? I will not be cranking for any week or so.
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