Went out hunting this morning and on the ride back I looked down and saw my 4wd light blinking. I then realized that 4wd was no longer engaged. Tried switching from 2wd back to 4wd and no luck. The light was still blinking and I could not get machine into 4wd. Any suggestions. I would rather do the work myself if possible.
Thanks,
Joe

 

What year is it? How many blinks does it do, in a series? It will be 2, 3 4, 5 or 6 blinks.

 

Year is 2003 and it looked like it was a series of two blinks.

 

2 blinks is....front final clutch speed sensor or related wire harness or fcc unit.
Start by checking the electrical plug, in the final clutch unit. Is it disconnected or full of water? The final clutch is just aft of the front differential.
The plug is #3 in this picture
front diff 450es

 

Thanks for the help. I'm getting my wrenches out in the morning and check it out. If I find that it is filled with water, can I simply dry it out or at that point does it need replacing?

Thanks again,
Joe

 

If the connector has water in it, dry it out, and fill it with dielectric grease before putting it together. That will keep water out.
If that isnt the problem , let me know, and Ill help with the next steps.

 

would 4 blinks by chance have something to do with a drained battery?

 

4 blinks, is either the chargeing system or the fcc unit. Check the votage at the battery while, the motor is running. At about 4000 rpm, it should be around 14 volts.

 

Took a little while to get the wrenches out. Went through the cleaning, drying and putting back together process and light still blinks. There was no real dirt, debris, or water in either the drive shaft sensor or the differential sensor. Wondering how water tight the connectors are or if the sensor is bad. What do you think?

Thanks,
Joe

 

Heres what the service manual says to do.
Check the tire sizes, they need to be the same. ( im sure they are stock, but if you replaced any, it could be the problem)
Check tire pressure in all tires. ( this will change the diameters, they shouldnt be drasticly different...tire to tire.)
You already checked the wire connections.
turn ign switch to off. Unplug the 3 wire plug (grey),that goes to the front final clutch speed sensor unit. hook up a voltmeter positive to the black/orange wire, and the negative to the green wire, on the wire harness side. Turn the key on ....should see 12 volts.
If you dont see battery voltage....open in the black /range wire, or shorted black orange wire.
If you see battery voltage....turn the key back to off. and we'll move on to the next step.