4x4 not working
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Joined: Jun 2008
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4x4 not working
I have a 2003 ford f-250 diesel that will not lock in four wheeel drive. I tried to lock in manually but still did not work. The fourl wheel drive light indicator does not even come on in the dash. My vents for defrost and a/c seem to work fine. Any idees on what to do?
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Have tried doing a search? if you search for 4x4 relays it may get you a path to follow. 
My guess would be that you have an electrical problem either in the switch or maybe one of the relays for the transfer case.
Have you crawled underneath to have a look-see at the harness to the transfer case to make sure a wire isn't broken or something?
My guess would be that you have an electrical problem either in the switch or maybe one of the relays for the transfer case.
Have you crawled underneath to have a look-see at the harness to the transfer case to make sure a wire isn't broken or something?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 421
From: Long Island USA
There's a whole bunch of stuff to check, but since you say the light doesn't come on in the dash, that means the transfer case is not engaging and has nothing to do with the hubs. Do this:
Get a test light. Pull the two-wire connection from the servo motor on the transfer case, and connect the test light.
While the engine is running, have a helper turn the 4x4 **** from 4x2 to 4x4HI, wait 10 seconds, and then turn it back. Watch the test light. If it lights each time the **** is turned, you have power to the motor and the motor is bad.
If the test light doesn't light, you have a problem upstream. While you're under there, check the multi-wire connector going to near the servo motor. That is a switch that tells the electronics which gear the transfer case is in. Make sure it's seated, and that the connections are clean.
If that checks out fine, check the fuses, and then the relays. The relays are in a small box near the main power distribution box near the master cylinder.
Get a test light. Pull the two-wire connection from the servo motor on the transfer case, and connect the test light.
While the engine is running, have a helper turn the 4x4 **** from 4x2 to 4x4HI, wait 10 seconds, and then turn it back. Watch the test light. If it lights each time the **** is turned, you have power to the motor and the motor is bad.
If the test light doesn't light, you have a problem upstream. While you're under there, check the multi-wire connector going to near the servo motor. That is a switch that tells the electronics which gear the transfer case is in. Make sure it's seated, and that the connections are clean.
If that checks out fine, check the fuses, and then the relays. The relays are in a small box near the main power distribution box near the master cylinder.
