I have +12 on pin 4 of the DB-9 serial port connector on my car sled.

Weird. I just triple checked and I don't get anything on that pin. I have the rest of it wired OK (I get NMEA output into the empeg with TX, RX, ground from serial and power from the amp line). Thanks for the offer of help, but I think I will just leave it wired to the amp line.

-Mike
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