looking for the vacuum dia for an 88 yj/4.2

[bp]

1044971

any one have the vacuum diagram for the 4x4 lockup ..and possible answers to the following problem the vacuum lockup on the differential works fine and the vacumm switch on the transfer case is also working. but i cannot get the 4x4 to engage and the light on the dash does not go on.

[addsig]

 

[Bounty__Hunter]

1044974

Pull the vacuum harness from the front axle and feel the ports for vacuum, engine running and Jeep in Neutral. One port should have strong vacuum in 2wd and the opposite port in 4wd. If it does, then take apart the shift motor (held to axle with 4bolts) and make sure everything is intact. Clean it really well with WD40 and make sure the shift fork moves smoothly. Reassemble and try 4wd.



Here's the vacuum diagram:

[addsig]