locked center diff?

[fernandol]

That is a good idea, I will probably install a cdl switch just in case.

 

[SUMOTOY]

yes, the light does come on in L4 and off in H4 so we are guessing the actuator in the locker is working.
Maybe this guy had some problem with the vc or the locker actuator and decided to lock it permanently since he didn't use the truck on paved roads? I guess the only way to find out is to open it up and take a look inside....???

Hopefuly someone else will have another idea.

Did you ck all the fuses? From the FSM, there appears to be a back feed electrical fuse for the diff locking relay, that just might cause locking in high without the light. I had a few beers last night looking at that mess they made in the locker circuit. Could it be the relay is working but the diff light or diff isn't really hooked up?

You have to be either locked or VC locked regardless. I'd think you'd feel something a little odd if it was VC locked (like slipping starts, etc). I still suspect the diff is locked, and that your guy either snipped a wire from the relay, or pulled a fuse. I really doubt he went into the box, nor should you yet. If it was me, I'd take a MM and ck that switch on the center diff. You should have continuity when the diff is locked and no continuity when it isn't, regardless of what was done with the other wires.

HTH

SJ

 

[-Spike-]

If it was me, I'd take a MM and ck that switch on the center diff. You should have continuity when the diff is locked and no continuity when it isn't, regardless of what was done with the other wires.

HTH

SJ

That right there is an excellent suggestion. I never considered that the electronics might not be telling you the actual story, but that test would confirm (or deny, hopefully, so you know where to start) movement of the actuator. If it does work properly you still don't know what's going on, but if the switch shows no change in high or low range you'll know you have a full-time locked CDL. I can't imagine anything else that would enable your truck to drive without a front driveshaft.

-Spike

 

[fernandol]

Ok, that's a good idea, i'll try that and see.

Thanks