Fuses are good.

4x4 dont work,had helper turn switch while I checked YEL and ORG wire on the tcase motor,nothing.

Removed panel on top of dash to reveal 4x4 relays. Checked BRN/WHT and ORG/LT BLU,nothing nor did I feel hear them click when I turned the ****.

That would be a bad GEM,correct?

Also my wipers work but when I turn the off they stop immediately instead of parking'',is this related to the GEM?

 

any opinions?

 

So I grabbed another GEM off Ebay and installed it,same problems as my old GEM.
No 4x4 and still have wiper parking issues.

What are the odds I have a bad tcase motor and bad wiper switch?

 

Checked the fuses 5x,nothing looks bad.
Well today I grabbed a new tcase motor and still no 4x4.
The new motor was in the 4H position,I didn't install it just laid in on the cross member to check operation.

If I turn the key on with the switch in 4H,the 4x4 light on dash lights up,if I turn the key on with switch in 2H,the light is off.The new tcase motor is in the 4H position.

I checked under the oval on pass side dash and there are 3 relays but today I noticed wires wasn't there according to some diagrams Ive seen.

Where are the 4x4 relays in a 01 supercrew?

 

Check on the firewall above the heater/a/c plenum.

Dave

 

hello dave, 2006 f250 all fuse ar good but no power to relay on firewall when i put the hub in manual and shift the **** to 4hi i have 4x4 but nothing on the fly any ideas

 

jprix, respectfully your running in circles and not getting good meaningful diagnostic results.
First, what is supposed to happen:
Dash switch in 4h powers the 'relay' through the GEM that allows fused power to the t-case motor.
You need to use a voltmeter to be sure what is or is not at the t-case motor when the Gem signals the relay to operate the t-case motor.
If no power to the t-case motor is the fuse supplying it good?
Is the relay operating to pass that power to the motor?
Is the harness good?
The Gem lights the dash light 'normally' when the action is complete.
Turning the dash switch to 2H will turn the light off but that's not indicative of a GEM issue.
When your test motor is plugged up in the 4H position the circuit board completes the circuit to the fire wall solenoids to direct engine vacuum to the actuator as long as the motor is running to supply vacuum.
.
The wipers are controlled by the GEM so it may or may not be the GEM for two different issues at the same time.
.
The key is to know how the system works in order to be able to recognize a fault cause.
Reason I am being a bit forceful is your replacing parts in hopes of a solution and it's not getting you anywhere.
Good luck.

 

just writing back to say thanks and i will try what you have said,thanks for getting back so quick