03 F350 4x4 not engaging...replaced every part in system? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 02-19-2014, 01:26 AM Thread Starter
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03 F350 4x4 not engaging...replaced every part in system?

My 2003 F350 7.3 will not engage four wheel drive. I have replaced switch on dash, both relays under hood. My vacuum pump and hoses do not seem to be issue. My heat and a/c vents all work great. My pump comes on and off normally. All connector plugs at transfer case are clean. No power is making it to the transfer case. What other components could be failing? Thanks
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post #2 of 7 Old 02-19-2014, 01:29 AM
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Do you hear the electric motor on the transfer case when you turn the switch on the dash to 4 HI ?
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post #3 of 7 Old 02-19-2014, 07:37 AM Thread Starter
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No noise from the electrical motor. There is no voltage or going to the motor either when the switch is turned on.
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post #4 of 7 Old 03-01-2014, 11:56 AM Thread Starter
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Can anyone help me with this?
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post #5 of 7 Old 03-04-2014, 09:07 AM
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check fuse
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post #6 of 7 Old 03-09-2014, 10:13 PM
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Did you check the 4x4 solenoid/actuator. Under the hood, on top of the motor, usually passengers side by the firewall. Hope this helps.
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post #7 of 7 Old 03-17-2014, 09:08 AM
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I had a 2000 do this and it turned out to be a broken wire on the driver fender liner where there are several harnesses. Fixed the wire and all good. Had to get on ground with a flashlight and shine up and have someone move the wires from above to even see the break. I've had 2 other trucks have breaks right there, including mine (which was my trailer reverse light circuit.

1999.5 707 Conversions Super Duty 7.3 Crew Cab LB Dually 4x4 Edge Evolution, Oil HPx, Fuel FRx, tons of filters, hutched n harpooned, B&W turnover ball and 5th wheel, lotsa goodies.
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