"Sorry I know what you are thinking, but this test is not legit. When you disconnect the ECU, you will have no load on the ignition. You will in fact have an "open ended" harness. Even if the harness had considerable resistance, the meter draws almost no current, and you will show battery voltage OK on both sides.

ONLY WAY to check for voltage drop is WITH THE HARNESS UNDER LOAD, as in, "in operatation.""

Hey Yancy- You got nothing to be sorry about. I think you're jumping the gun... Circuit integrity comes way after we figure out if everything is wired correctly to begin with. If the ECU was tapped after the ballast, you're only getting 8VDC @ ECU no matter what. I guess you just want to take over? I feel sorry for this guy. This is what's bad about the internet.