Question about 2000 Ford F350 Super Duty Super Cab
Check dash switch
Posted on Nov 14, 2009
Im assuming you have an electric switch, and have checked the 4wd motor on the transfer case, and are not finding any power there. Check your switch, and the fuses and relays in the system. If the switch receives no power, then it cannot transfer any power to the motor, in that case your problem is coming from a relay or possibly a broken wire to the power side of the switch. Check to see if your grounds are good at the switch and at the relay. If you determine that the switch is good, and the motor is good, and all of the fuses and relays are good, and you are getting power to the switch, and power out of the switch, but nothing at the 4wd motor, then you most likely have a break in one of the wires from the switch to the motor. This problem will take some good electrical diagnosis, but hopefully this will help you narrow down the problem!
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace
Posted on Dec 15, 2009
SOURCE: Four-wheel drive not working. No
Was the transfer case fluid changed every 50K miles? This very important on these trucks. The Transfer Case Control Module (TCCM) could be at fault, especially since you have no lights on the selector switch. Is the Service 4x4 light on? When you switch from 2H to any of the 4 wheel drive selections, do you hear any actuator noises coming from under the truck?
Posted on Dec 09, 2010
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