To test the diverter valve, put your hand over the vent side and rev the engine, you should feel the pressure as the revs return to idle. I am a little lost on the rest of your question, however. Did you check the archives for vacume diagrams for your year?
79Cherokee Chief<br />4\" BDS Lift<br />Custom Bumper <br />33\"x 11.5\" x 15\" BFG All-Terrains"<br /> T.H. 400 B.W.1339 Quadra Trac <br />Mile marker 16% O.D.part time kit<br />360c.i. Edelbrock pkg.<br />MSD ign. & coil <br/>Bored .030 over<br />Tri-Y headers<br />stainless steel exhaust<br />mustang seats<br />Holley 4bbl