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Well, I was wrong. All lockers have air, front axle is the only one that will engage. I guess I'll pull the actuators and look at them. Rig them to apply air on the bench and see if they work.

I think I have them working now. Found a hose on the middle axle that had been torn in half. Repaired it, and when locking all the axles now, you can feel it in the steering wheel and the inside tires on the rear dig up the terrain when turning. Scared to put it in the mud to test them because...

Repaired the hose, but still don't hear a clunk. I hear the clunk when the front axle locks. I know air is going to the center axle. Going to have my mechanic tear into the rear lockers and see what's up I guess.

Very useful info, thanks!

Is there a device that controls (latches / unlatches) the solenoids when sequentially locking or unlocking of the axles each time the switch is pressed? Also, there are four solenoids. I know three of them control the individual lockers on each axle, but what does the fourth one do?

Discovered the hose going to the center locker has a big hole in it. Will replace it and see if the axle will lock. having said that, what is the best way to determine if the axle is locking without chaining the truck to a giant tree or something?

Thanks Eli!

I didn't have time to mess with them this weekend. I think the first order of business will be to determine if the solenoids are operating and sending air to the locker mechanisms. Once I determine that, I'll go from there. If they are getting air, the old MM oil trick will be applied.

I'll monkey with them. Hopefully I can get them working.

Only one axle indicator would light up before I learned to change the CTIS setting. I'll get my son to help me tomorrow and get under the truck and listen to see if I can hear them engage (or not) while he changes the setting.

Apparently, I have discovered, there is an interlock that will not allow the axles to all lock if the CTIS is in highway mode. In any other mode, all three of the axles lock, or at least the indicators on the dash say they are locking. So, if your CTIS is functional, set it to any setting other...

The air lockers on my truck aren't working. You can here them clicking but they won't engage. Where should I start?