I am having the same problem with my new 6AL. car won't start unless I jump it. I have Batt. in trunk. I have 9.5v cranking. called MSD tech they said my Voltage is to low. sheet that came with box says it will work from 9 to 16 v. So Tech support and instructions don't agree. in the mean time I am stuck with a sick Cuda. they should say it takes two batt. to run their sys. I am thinking about sending it all back and try somebody else's sys.