'86 4KQ CS

[SuffolkD at aol.com]

The "4WD" system of differentials is vacuum operated.  See if there are 
vacuum leaks in the hoses.
HTH - Scott bY BOSTON

> From: "Mr. Reginald S. Archer" <>
> 
> What would cause the 4WD to not work?  Is there any troubleshooting I can do 
> to find out what the problem is.  I cannot switch the 4wd on, or better yet, 
> switching it on has no effect, the "on" indicator lights on the panel do not 
> come on either.  
>