In reply to:

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You'd use the amp control line to power up the wireless adaptor too.

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Hmm.. Is this suck a good idea? My amp's have enough of a draw on them that they'd kill my car within the hour if left on without ignition.. Maybe leave the wireless ethernet on constantly? I think the draw on the lucent one that I was looking at was about 1a@5volts...
-mark

...proud to have owned one of the first Mark I units