Mopar had 12v at crank (start) which bypasses the ballast resister. Then when the key goes back to run after starting, it goes through the ballast to run on around 8v. You have to make sure you have 12v both at crank and run with the key.
^^THIS^^ and also, during cranking, the "run" voltage goes dead. The only voltage available is the bypass circuit, these are IGN1 and IGN2. If you don't have a shop manual go to MyMopar and download one. You also should save the aftermarket wiring diagrrams, on same site, which in certain situations are easier to deal with.
