On an '88 Thunderbird, there should be two plugs for the OBD 1 testing. The big plug is easy, what color is the single wire?
EVTM says W/R for STI wire.
^ this
STI connector has light grey plastic.
See attached picture.
Yep white with red stripe. Mine still has the factory single terminal connector as well.
My gray plastic piece is missing, but, I can locate that gray piece and snap my wire into it. I have a holder for those plugs to snap into when not in use. I think I'll install that next weekend. Just have to drill a small hole and it snaps right in. Then the plugs into it.
Seek.....can you post a big clear pic of that plug from the back side as well?
Seek....yours is different than mine. Mine has one more wire than yours.
Thunderjet, can you post a pic of yours front and back?