Mark, thanks so much for that additional data about the voltage regulator on the Arduino board.

I tried hooking it up to 12v on the test bench, and the Arduino board got a lot warmer than I'd like it to get for a car installation.

So what I'm trying next is just ordering a different Pololu voltage regulator that is pin-compatible but outputs 6v for the Arduino VIN pin. We'll see how that does. smile
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Tony Fabris