Re: electric 4wd broken
The contacts inside the motor get corrosion on them and lose contact.
The Cheap way to fix em without replacement, Go to parts store and buy a SET od tamper-proof Torx bits, I think it's a T-27 (I spent $5.00), mark (index)and take off the round, flat cover, and with some emery cloth clean the brass contacts. reinstall the cover and it will work fine.
Now if you have to remove the entire motor form the t-case, mark where it goes so it will return in the exact spot (Index)
Done this to many Explorers, Rangers, F-150's, and Bronco's with the Touch Button 4x4 and never had a problem.
Ford guy with twin rockcrawling Samurai's [img]/wwwthreads_images/icons/wink.gif[/img]