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UPDATE 5/22/26: Replaced the alternator. no longer see a voltage dropout when started. the communication still drops once started leading me to believe that an ignition voltage somewhere is suspect. took a look at the diagnostic port and did some voltage readings. I found the following:
Pin 1 - 11.98V
Pin 2 - Empty
Pin 3 - K-Lead 11.7V
Pin 4 - Ground good
Pin 5 - Ground good
Pin 6 - Empty
Pin 7 - K-lead 8.6V
Pin 8 - K-Line 7.5V
Pin 9 - TN Signal - 11.4V
Pin 10 - KVA?? - 8.8V
Pin 11 - Empty
Pin 12 - Software Voltage?? - 0.4 fluctuating
Pin 13 - Empty
Pin 14 - Empty
Pin 15 - Empty
Pin 16 - 12V
Not sure what 9, 10, and 12 are. I could use some help in identifying what they are for. Without knowing, I'm going to take measurements from my other 99 Boxster and compare but in the meantime, Please help.
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