Auto 4WD not working
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Posting Guru
Joined: Oct 2006
Posts: 1,078
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From: New London, Mo
Auto 4WD not working
I have a 2002 f350 with a 7.3 psd with a 4r100 and im trying to diagnose the 4wd. The electronic solenoid on the transfercase does not work. i have voltage to the 4wd switch in the dash and to wiring harness where it plugs into the solenoid. but the solenoind does nothing. is there any way to test the solenoid? Also how does the 4wd operate on these trucks? ive never had to mess with one before.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
You mentioned the solenoid. Did you mean the relay?
If so, follow the diagram I posted above. That should help you determine the cause. You can manually trigger the grounds to eliminate the 4WD Control Module to test them.
If so, follow the diagram I posted above. That should help you determine the cause. You can manually trigger the grounds to eliminate the 4WD Control Module to test them.
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