(1) pull the female connector/wire off of the "grn" terminal on the starter relay & with a jumper wire with alligator clips on each end ground the male lug on the starter relay to ground & see if it will crank/start with the key. (2) If it cranks, pull the 3 wire connector off of the side of the trans case & ground the center female pin in the connector you removed, to the trans case & see if it will crank/start. If it does then put the trans in park & ohm the center pin in the trans piece to the trans case & see if you have continuity. (4) if it wont crank (but did in (1) trace that wire back to the firewall bulkhead & seperate the bulkhead & check/clean those 2 brass terminals on either half. sometimes just seperating the halves then replacing em is enough to restore continuity. If it would not crank in (1) originally; with your meter or test light see if you have fire at the yellow wire female connector itself at the starter relay "ign" terminal while someone holds the key to start. If no fire check that pair of brass terminals in the bulkhead halves for the "start" circuit. www.mymopar.com has the colors for you. Short version: starter relay needs fire to the "ign" terminal for it to crank/starter relay "grn" terminal needs to be grounded in park/neutral. Holler back when you can