I have a '99 ram with a 5.9 and four wheel drive broke. When it broke it was in four wheel drive, the light started blinking, it went out then no more four wheel drive. Any ideas what it might be?

 

sure the vaccum lines didn't come loose or have a puncture somewhere in the line? This happend to me some time ago, now my lines are all chopped up and most of them are 1/8" plastic lines now. I'd at least start with the easiest solution

 

Vacuum lines

 

Does anyone have a diagram of the vacuum lines and where they plug in so I can avoid giving my not very hard earned money to the dealer?

 

here you go. also do a search here on cad for additional posts.
http://www.4x4wire.com/dodge/tech/solid_axle_cad/
http://www.dodgeram.org/tech/repair/..._engagment.htm