1991 Chevy Suburban 4WD Schematic?

[Jersey]

Sorry mods if i put this in the wrong section or, if i wasn't suppose to post something like this here at all.

 

Of course, snow to hit tonight/tomorrow and my 4wd in the suburban is not engaging. I tested the actuator on the axle and it works fine, it's just not receiving the 12v it needs to engage. It's a new actuator that i replaced last year. The 4wd fuse is fine. I tried to trace the Pink/White off the back of the fuse block but i lose it in the main wire harness mess. It's a manual shift on the floor and i see the switch on the T-case, but i dont know what it's suppose to supply (12v or ground) and where it goes. The Hayes/Chilton manuals i have don't show any type of wiring schematic for the 4WD unit. I'm thinking the pink/white from behind the fuse block is the supply for a 4wd relay somewhere, but i just can't find it, if one even exists. If anyone would happen to have a page from an FSM showing the 4WD wiring schematic, it would be greatly appreciated. Thanks.