I havent played with it in a while, but last time I went to put it into 4wd(it was below freexing) I got nothing. Before that it was working, but the light wouldnt come on. I'm pretty sure all the vacuum lines are hooked up right and if I give vac directly to the 4wd indicator switch on the firewall the light comes on. I played with the vacuum a little bit and last time I checked the green line had vac when trans case was in 2wd, but not 4wd. The yellow line always had vacuum and there are two yellows. I dont know whats supposed to happen with the 2nd yellow line; I assume just plug it. I'll take any opinions you can offer. Maybe its more likely the switch on the t-case since I have constant vac on the yellow, but I"ll let you tell me.
One line should be yellow at the shift motor and one line should be green. If the vacuum does not change from one line to the other when you shift in and out of 4 wheel, then you have a bad vacuum switch on the transfer case.
Thanks for all the info. As soon as I can get to the jeep I'll bring it down and start working on it. Its kind of buried under a foot and a half of snow and ice. I think it may be hard to move without 4wd so I'll have to wait for some thaw out. I think its supposed to warm up a little next week so there might be some melting.
I thought about the posi, but in all reality I probably wont keep it long term. I picked it up off a trade and figure I'll have better luck selling the YJ than the K5 I traded for it. I'll probably put it for sale in the spring/early summer and just drive it until I get what I want for it. The thing is in great shape, the frame has no rot anywhere. So hopefully I'll be able to do decent on selling it. You know some girl is going to want one and her dad will buy her what she wants.
It took me two hours but I got it out of the snow. First challenge was trying to find a way to get some power to the battery. It also turns out the 4wd was working, so that is good. Here's the problem though; when all the vac lines are hooked to the axle I am getting constant vac on axle side of the yellow line, not the t-case side. I think the vac from the green is getting through the motor. So should I just go and replace the shift motor now then? I checked all the lines coming from the t-case and they seemed to be working correctly.
I still think you need a switch. When you are in four wheel drive, the vacuum should be on the yellow line at the shift motor. The green line is supposed to have vacuum when you are in two wheel drive.
It sounds like you are looking for a return in vacuum from the shift motor, but it doesn't work that way. Only one line will have vacuum on it.
Replace the vacuum switch on the transfer case. I can almost guarantee that is the problem. Besides, it is much cheaper than a shift motor and changes out in under two minutes.
The switch seems to be working right. I checked all the lines when they were disconnected from the axle and yellow had vac in 4wd and green had vac in 2wd. When I hook the lines up to the axle and have it in 2wd it seems like the vac from the green is causing vac on yellow, but yellow coming from the axle, not the tcase. I tried blowing out the inlets on the shift motor and did have air coming out of the yellow inlet while blowing air into the green inlet.
I ordered it from advance auto last night and they will have it in a couple of days. They were kind enough to match a price I found online and I got it for $82, not bad at all to me. Thanks for all the help amerijeep and I'll let you know how it turns out.