Ok so update: I did find that when I connect my scanner to check nthe ECM voltage, as soon as it makes the connection shortly after plugged in to the OBD port that is when all the lights/messages pop up on the dash and all the guages shut off. Also, AC, radio, signals etc also lose power. It does retain power to the windows and headlights. Once I unplug my scanner, everything on the dash goes back to normal.
Anyone ever experienced this? (Or find a fix)? I need to check more grounds and fuses, but hopefully it's not a bad ECM...
I hate electrical gremlins...
Andrew