Fluctuating neg. to ground on ignition coil

Hey, Del,

You're 100% the last guy I wanna argue with; you do too much good work. I have done the cold and hot resistance checks on the OEM ballast versus a few different SMP RU-series ballasts. I've found that the higher cold resistance ballasts change their resistance by as large or larger ratio than the OEM one. I'd expect that 1.3 ohm cold ballast to be around 5 ohms when hot... vs the 2-2.2 ohms hot for the OEM. That is a real coil current drop.

And the OP is subtracting his lead resistance from the readings to get more accuracy.

I cannot see any reason to not put the system into the right configuration as far as ballast resistance. I am willing to bet a lot of OEM systems have been blamed for being bad when it was just something this simple....