Actually the two cannot affect each other because of the switch. You'd have to look up circuit routing. Ma was BAD about using "unrelated" connectors for junction points. The other thing that might be happening is "coincidence" that is, you are wiggling yet another bad connection somewhere, causing the "other problem"
Let's see where the turn signal power goes / comes from..............
On page 8-152, find in the index the turn flasher, at A-19, and go there
Follow wire D1-18BK off the right of the page, through the next page, 8-159, and down the page on 8-160, to where it junctions at CE2(B) with wire B1-18W
this point is right at the bulkhead disconnect.
Now follow wire B1-18W off and through the bottom of the next page.......
and through 8-162....
and then up the page 8-163, where you can see it junctions with the RADIO connector......
and on up the page........
and off the left on wire X12-14R
follow that into the right side of page 8-162, and you can see that this junctions with the BLOWER SWITCH and then goes on down to the FUSE PANEL!!!!
Yet another thing you can do is refer to page 8-114 or therabouts which gives you a list of what fuses supply what
Some of this gets confusing between heat / AC. It might be a bit more clear if you refer somewhat to the 72 book. This could very well be WRONG as per changes made in 73, but the thing is, the 72 book has the "old way" of drawing the diagrams. In this case, the AC wiring is in the heating / AC section and not the electrical (section 8) I only mention this because sometimes, "it's easier to follow" than the new style diagrams
Below is the 72 diagram, from page 24-52. Again, don't go by this literally, use it as a guide to help visualize
