4x4 Not working (no light)

[sbveenker]

So I have a 2003 F350 6.0 and when you shift it into 4wd hi or low nothing happens. No lights on the dash come on and I have tested and there is no power going to the motor on the t-case. Any ideas? I have tested all the fuses I could find and have switched out relays under the hood to check that, but still nada. PLEASE HELP the snow is about to fly

[motorman173]

I am having the same problem. i've been searching post but not finding this same situation. Mostly hub problems.

[REGSHD]

Did you find the problem yet?

[motorman173]

I replaced the motor on the transfer case but still nothing. I can hear the relays clicking under the hood when I turn the switch but its not engageing. No light on the dash or the switch. Also no sign of vacume leak. a/c stays the same when I turn 4wd on.

[twoicebergs]

So, there is now power at the TC switch motor? My next question is did you manually turn the engagement shaft when you had the motor off to see if it would engage easily, before putting the new one on? I can't remember the exact motor logic anymore, but it tries for about 20 seconds to engage before it cycles itself off. Unfortunately, the ESOF can be a PITA when things stiffen up in the TC. It is always a good idea to cycle it and run it in 4x4 on a regular basis, just not on a hard surface.

The light comes on when the motor has rotated the shaft to the correct position.

[motorman173]

I did not try to turn the shaft. I take it that it will get bound up internally if not used often. I bought the truck 8 yrs old with 20,000 miles on . its got 27,000 now. I was hoping it would'nt be anything internal with that low milage. Will moving it manualy get it to loosen up or do i have to move it then drive it and then move it back? Also only one pin had power to the motor . I did'nt know if they both should or not. Thanks for help. Im kinda stuck.

[roche837]

Also have the same problem, mine is an 03 also, out of curiosity does your 4x4 switch light up with your parking lights on, mine are out, wondering if we have the same symptoms, maybe we can both figure this out, im very frustrated.

[motorman173]

No the switch does not light up at all. The 4X4 and LOW RANGE in the instrument cluster only light up when I start the engine and then go out like all the others. Nothing lights up when I turn the 4x4 switch.

[roche837]

Originally Posted by motorman173

No the switch does not light up at all. The 4X4 and LOW RANGE in the instrument cluster only light up when I start the engine and then go out like all the others. Nothing lights up when I turn the 4x4 switch.

We have the same exact problem, all my fuses and relays check good, i pulled the motor off the tcase and the 2 wire plug for motor operation has no power going to it, i have power at the switch.

Ive been told there is a separate 4x4 moudle behind the glovebox, but ive searched and everything comes back to the gem module.

My 4x4 also lights up when you start the truck but them goes out.

[ZMANN]

the 4x4 and dash light are tied to the PCM

the system has no clue what so ever if the hubs did anything

but the transfer case motor has some hall effect sensors and can tell if the motor moved to the expected position and then will turn the dash light on accordingly