O4wd switch doesnt light up and wont go into 4wd hi or low. Just used it 2 wks ago. I checked fuse n its ok. Any ideas?

Hi i have rexton 2008 used to have a problem with 4wd check light. 4wd check light course faulty vacuum pressure velve.thee valve is located between the front left light and the battery,is mounted under the battery stand. Got two small pipes going to the gear box.

First thing is to check the fuse. If the fuse is ok,then the shift fork motor might be bad

Maybe a loose wire or possibly a rodent chewed through one of the wires. Check to make certain all leads are free of debris and connected and no bare wires are rubbing against each other.

electric dis/engage motor on the transfer case is not working check connections.check ALL fuses under dash and hood

the switch is probably from a newer modle truck, although they work the indicator lights don't always work, and check the 4x4 fuse in the fuse panel on the left side of the dash by the drivers door

check the fuse for transfer case shift moter if thats ok
check the connections at the moter then have someone push the button while use a test light or
meter to check for power if you have power at the
moter and it makes no sound odds are bad moter

sound like electrical problem in igntion switch. check all wiring to transfer case electric motors . to the 2 to 4wd switch.

First thing to make sure of is to check for a blown fuse. The fuse location is marked 4WD and it should be a 25 amp fuse. If the fuse is bad, the lights on the 4wd console wont light up. If the lights do light up, then you can move to the transfer case. On top of the transfer case, toward the rear of the truck is a switch that has a 2 wire connector. That switch sends power to the front axle actuator when you try to enagage 4wd inside the truck. That could be bad. The switch is threaded into the transfer case and is still available through GM. If the switch is ok and the wiring that attaches to it is ok, then you can move up to the axle. Threaded into the front axle is the front axle actuator. These actuators are prone to failure in older trucks and is very prone to cold weather failure. You can test the actuator by removing it and then WITHOUT the truck running, put the truck into 4wd and then turn the key to the hot position. The plunger inside the actuator will extended outwards. More than likely it will be one of those 3 things. If it still wont engage, you may have a short in one of the wiring harnesses associated with the 4wd system. Also, you may have a damaged transfer case. To check the transfer case, put the truck in 4wd without it running and then crawl underneath and see if you can turn the front shaft by hand. If not....it's good. If you can....then the shifter forks inside the case are worn or damaged. I hope this helps.....start small and work your way up!

need to check the fluid in transfer case