The CDL switch located on the transfer case can test good, but in fact still not be working right. I ran into this on my truck, I pulled the switch from the transfer case, my meter said it was working, when in fact my center diff lock would still not lock. What i ended up doing to get it working, I took a can of contact cleaner, along with some compressed air, and flushed out the switch from the ball bearing end. Then i kept compressing that ball bearing in my hand, i compressed that bearing about 300 times to make sure that the contacts inside it were good and clean. As near as i can tell, many of these trucks get little to no low range use, so over years of non use the inside of that switch gets gummed up. Try giving it a real good cleaning, won't cost you anything other then your time.
Diff. Lock Issue
- Thread starter Kevin LeClaire
- Start date
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- Thread starter
- #42
Great idea I will do that.
- Thread starter
- #43
I puled the switch and cleaned the hell out of it and compressed it a couple hundred times and i pluged it in and compresed it with vice grips and turned ignition switch on and diff lock light on dash came on. So does this tell me the trans relay is out?
- Thread starter
- #44
Ya never guess what happened, the diff lock is working. I was replacing the throttle cable and rockauto sent me the wrong one,the screw with the two nuts on them to ajust well that screw isn't long enough. So i put the other one back on and took it outside beuteful day out 40 deg out so anyways for the hell of it i put the transfer case in low, holy crap the diff light come. I think that deserves a littli scotch tonight. I took a little ride down to my buddies house well when i was backing out I went off the driveway a little and crap, I just hade posie, this is going to be the real test I got out and locked the front hubs in pressed the diff lock and low and behold the light come on, little more scotch, i eased right on out. I tell ya it is a good felling to have it wowking. I will take some pictures now that it is all put together. All you guys that helped out thank you very much and I will toast you guys with a little scotch.