Mattax said

You did a nice job with them. View attachment 1715478368
Its odd but the supp doesn't have the circuit coding for the instrument diagram where its most helpful. It seems like it went out the door a little less finished. I verified the 2 speed wiper switch connections against mine last night. View attachment 1715478369

I'm sympathetic with extending wires or adding connections, but it seems like asking for problems. Between the tips and photos here etc, and the 67 Supplement, I was able to reach everything without too much contortion or difficulty. The two points of difficulty were the heater control mounting screws and the unexpected ground wire. The heater screws might have been easier with the panel partially out. IIRC thats what I did 25 years ago when I was working with only the 68 FSM for guidance. This time I wanted to remove all screws and bezels I could with the panel firmly mounted to the dash.
The downside of extensions is more wire too stuff in there without strain on the connectors. And to my thinking, every additional splice and connection is something that could go wrong.

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RedFish said

Try to follow the current paths. Positive origin from -> to.
Power comes from the fuse box to the radio on a red wire. If white joins it and goes to 'D' cavity of bulkhead, does it join different color wire ( black or red again) in the terminal that takes 12 volts to the turn signal switch? Is there a wire outside that 'D' of bulkhead? I'm guessing not.
I don't know where 67 got 12 volts to turn signal switch. Could be directly from fuse box.
I'm pretty sure the wire from brake lamp switch to turn signal switch is white. They wouldn't have 2 of same color (white) going to that connector. So to pick up 12 volts at radio connector with a white jumper needs to change colors and join the front signal wires etc... to/from the turn signal switch, (taped into same harness). Like I said before, they would move things around to simplify or simply to save a little wire.
Orange to turn signal switch connector is for a column shift indicator lamp. That may be common to all, floor shift or not.
I know the rally panel has 2 circuit boards, needs orange wire to both. In 67 harness there is a weld splice buried under tape where this wire branches. Maybe they got them from 2 different locations in the 68 harness to delete that weld splice.
I couldn't sort it all on a computer screen. I need printed on paper side by side to sort all these differences.

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