Turn signal switch, taillight not lighting up, no dash lights and more!

A lot of A body stuff carries over. I don’t know the details on the early A body cars but a lot of the 68-72 stuff is similar, 73-75 too.
1967 was a weird year with early and late stuff. 1976 had some one year only stuff related to emission controls.
I think I got this figured though.
1972 did have a few small unique things. The plastic housings used the external ground with a tab on the outer edges of the bulb socket.

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This is the only year that I have seen that has this two wire terminal to a blue colored collar. Sort of weird.

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Looking close, there is a tab to index the collar in the socket to get the bulb to make contact with the “contacts”.

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If that collar is out of position, the bulb’s contacts won’t touch, no light. There are three indentations, two are for the pins on the side of the bulb housing, one is to index the collar.

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I did have power to the wires.

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The inside of the socket was cleaned with a Scotch Brite, the collar was put in properly and….

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Now onto dealing with the dead gauge lights.
That is usually the headlight switch, right ?