Hi all. I am a first time poster. I have a 1999 Explorer 4.0 Auto with the Auto / 4WD High / 4WD Low dash switch. I followed the troubleshooting directions on checking the 4WD system operation out, but my 4WD Low will not illuminate or engage. I have fully operational 4WD High and the light illuminates fine. It switches between Auto and 4WD High fine. The truck simply does nothing when I switch to 4WD Low. Any thoughts on how to troubleshoot it? Could it simply be the dash switch? Please help.
Thanks,
Ben

 

welcome to R-F, Ben!
to switch on the 4wd Low, you need to have the vehicle in park and depress and hold down the brake pedal. THEN the 4wd Low indicator should light up.

 

I have tried it with vehicle in Park and Neutral. Nothing. It will not move from 4WD High. No 4WD Low Light and no Low engagement. Any ideas?

 

when you turned the switch to 4wd Low, you had the brake pedal pushed down and held it?

 

yes brake is held and the Low does not engage at all. Not a bulb or method issue.