Good info.
The car possibly dies because most of the ECU's I've seen will fail to operate once a set voltage drops to that level. 10V's is totally unacceptable.....
Next question is ---- where is the power take off for your ECU?? Most aftermarket systems require you to take power directly from the battery... "Most" might be an overstatement - but I haven't seen one that doesn't ask for this type connection. The battery acts as a line conditioner - and has the reserve capacity for when the alternator is operating in "on/off" charging (think voltage regulator).
Last edited by GregWeld; 12-03-2017 at 10:09 AM.
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