Specific dash light assistance
Hey all. 1967 factory RS
First, I enjoy the forum and have used to it correct several minor issues. That being said I have been through the sticky's and searched prior to posting my question.
Second, we can likely rule out the following parts (not el cheapo versions) that I have already addressed:
-(Under the hood), horn,headlights,highbeams all functioning like they should.
-replaced headlight dash switch
-replaced dimmer switch and pigtail connector
-replaced all fuses/cleaned fuse terminals
-replaced turn signal switch (8-wire) and relays (hazards and turn signals working great)
-replaced dash circuit board
-replaced all dash bulb sockets
-replaced all dash bulbs
-installed common ground to top gauge to dash panel mounting screw
I have checked the circuit board as mentioned in the sticky and everything is checking clear.
Highbeam indicator works, so ground is good.
All lower dash bulbs appear to work as intended on startup or when forced to illuminate via manipulating ground/12v as needed.
Issue is none of the upper dash lamp bulbs (gauge illumination) are working. This I have traced to lack of 12v at the grey wire on the harness.
But here's is where I'm stuck. While my harness appears intact, I can't trace the grey wire back to the headlamp switch. Looking at the wiring diagram, it appears it should come from the heater instrument lamp. I DONT HAVE ONE. I have a previously installed Vintage Air setup.
SOOOO, assuming the grey wire goes to the heater/console harness after leaving the fuse block, Is it necessary to wire a jumper on the grey wire to continue the circuit to the dash harness?
Any input would be helpful at this point. I will update on any progress made.