Hi sghioto, Although you managed to get MN107 to confirm that the 12 volt input on the coaxial power connector to the Arduino drops to zero when the ignition switch is off I suspect that something is holding the +5 volt rail up when the ignition is off. The long time it seems to take before applying power to the Arduino makes it startup correctly seems to rule out the possibility of it being caused capacitors on the Arduino board. Before the mosfet driver was used the the PWM signal would have held the 5 volt rail up when the ignition switch was off but with the mosfet driver that should not be possible. I have asked twice for the 5 volt rail to be checked after the ignition switch was set to off but have not yet had an answer.
Les.
Les.