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Re: 1994 ford explorer 4 wheel drive not working
Go to the engine compartment where the relays are located with the fuses. Check or replace the 4 wheel auto engage relay , maybe is not working. Is very clearly mark, I believe is the top right one looking at the bost front front of vehicle to the back. There is a diagram drawing of each relay in the cover, so you can't go wrong.
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all wheel drive vehicles have to work at both ends all the time unless you have a major failure in the drive train. That is why it is called all wheel drive as opposed to 4 wheel drive. With 4 wheel drive you have the option of rear wheel drive or 4 wheel drive and normally in a high ratio or low ratio gear selection. With some all wheel drive vehicles there is a selector that locks the middle diff and creates a 4 wheel drive option without the high/low gear ratio option. So in practice if the both front wheels are in the bog then there is no all wheel drive as the centre diff is working as it should and placing all the action in the rear wheels which will not be turning as they have traction so the front wheels spin faster.. If you have a centre diff lock option ensure that it is operational.
Something you can do is to tap the 4/4 motor under drivers side on the back of transfer case with key on engine off. Have someone work the buttons as you gently tap the motor. Don't hit so hard as to dent it. Usually works.
I miss spoke...What had happen was that my front end was turning but hubs were not engaging...finally figured out automatic hubs were bad... when my ex had it she had a bearing repacking done, but they also put grease in hub.. wore down parts.. hope that helps..
First check your 4 wheel drive switch to make sure it works, for on an off settings. (Use a volt-ohm meter for this. On should show continuity in the readings (if digital then it should show zeros in the dial) Off should show no continuity or 1.0 in the dial.
1. Check your fuses.
2, IF OK, then check your FUSE LINKS.
3. IF OK, then check your 4 Wheel Drive relay in the fuse box.
4. IF OK, then check continuity of the wires harness to the 4 wheel drive switch for DC voltage.