Hello everyone, I have a 2007 Ford f250 powerstroke. My 4 wheel drive started acting funny, it would engage sometimes but not other times. Finally over christmas it wouldnt engage at all. Replaced the switch, the actuator motor on the T-case and the 4x4 control module above the glovebox. Still nothing engaging the motor on the T-case. No power to the plugs below either. Any info is greatly appreciated. Thanks

 

on the driver side next to the battery there's a plastic box that has 2 relays in it.. inspect the relays and test.. replace if necessary

cheers

 

Checked relays, flip flopped relays, checked for corrosion. Still nothing.

 

Don't know if your truck uses vacuum to engage and disengage hubs like my 2000. If so id replace hub lock oring and hub bearing oring. I could tell when bad because my vent control would default to defrost every time I tried to engage 4x4. also vacuum hose on steering knuckle.

 

There are no Vac lines running to the front hubs. My main issue is no power to the t-case shift motor. If I open up glove box and disconnect the 4 wheel drive control module and probe pins 5 and 6 on the C281B side with a test light grounded and key on I can manually shift the Tcase from 2wd to 4wd. Do I have a bad ground somewhere possibly>?