I supplied an independent power to the ballasts, by a direct wire from the battery terminals in the engine bay. To trigger the power to the AEs, I tapped into one of wires in the relay box in the engine bay, that was energized when the engine was on - I used a relay to isolate the AE power from the battery terminals from the triggering event. as a result, when engine started, that triggered the relay that provided battery power to the AEs. thus I totally avoided the issue of tapping into any circuit that could have set off the check lights or disrupt any other operation of the vehicle. I used a small relay that had 30 mA triggering current...