Quote Originally Posted by chevynut View Post
What is the voltage at the "BAT" terminal while cranking? If it stays at 12V, the problem is your ignition switch can't handle the current needed for the ECM. You might need a relay in the "RUN" mode too. If the BAT terminal drops to 9V as well, your problem is between the ignition switch and battery. If the battery drops to 9V while cranking, you have a bad battery.
I'll check voltage drop on battery tonight. I have a number of theories about what could be the problem such as ignition switch drops voltage to 9V during crank to IGN (which I could relay the IGN prongs to boost it back up to 12V), the mini starter may be draining to much voltage (but to just 9V???) or since my battery is in the trunk the 2/0 cable isn't carrying the required load or my battery could have went weak though I do all my testing with the battery charger hooked up.
Josh