4wd

hey guys I am having a problem with my 4 hi on my 96 sierra. Not engaging so I thought okay it is the actuator so I put in the new so called update with the wiring harness, all seemed to be good until till today the (day after)4 hi kicked out by itself which it did before also, and I could not get it to go back in. 4 lo works fine. Confused? I am I am going to try an reset the comp tommorow. also the fuse is good checked it. Does any know what else is could be?? I don't want to have to bring it in Thanks guys.

I guess my suggestion is to check any wiring that has to do with the actuator. I mean otherwise you'd probably have to take it in and have a pro check it out....good luck anyway, hope you find the problem

Nick