Quote Originally Posted by Dirk Diggler
I have a question about the grounds. My WB is powered from my Cigarette lighter. It is my understanding that the ODB2 port is powered on that circuit.

Do they share the same grounds or do I still need to go to pin 4
I guess a quick test with a multimeter will determine how close (electrically) the grounds are.

Our new V2 interface has 4 sets of matched A/D voltage and ground pairs (8 wires) so potential ground offset problems will be eliminated.

Regards
Paul