Yup, my vacuum theory was easy to test and disprove. Back to the drawing board. What gets me is I know it worked for several dozen miles since I had others behind me who were looking for issues. Now itís 100% hard fail with nary a flicker. I really dont want to change out this switch again if I can help it. I have an epas in the car which makes getting to this thing almost impossible. Iím going to crawl under there again though Iím getting to old to do this with the drivers seat in!
I know this is crazy but I canít help but wonder if my ďmystery boltĒ has something to do with this. I found a large-ish bolt in the driverís footwell a few weeks ago and have been unable to find itís home. Itís the size of bolt that holds the dash to the interior pillar on either side (but they are all in place). Given that Iíve had this thing totally apart multiple times and for months at a time, I finally decided it was a bolt I left laying in somewhere under the dash when I put it all back together.
Time for a little deeper look...
1969 r-code Mach I w/ C6, AC