[AZKen]

There are two violets. They are not associated with each other. The one I've been speaking of is from the turn signal switch.
Brown comes from Ignition ACC. It is a switched hot. It goes to fuse panel and "jumps" to flasher X".
Violet comes from T/C switch to fuse panel Flasher "L".

The two violets are very confusing and extra confusing becasue you have separate park bulbs inside headlight. I now understand what you were saying/thinking.

That other violet is for parking lights which are in the headlight. My apologies for not seeing that the idiots at GMC used a violet there also. You must have already wired that violet to the bulbs inside headlight. That VIO does connect both headlight park bulbs together so that they can be turned on by the headlight switch. But NOT the front T/S sockets. They have to be separated to flash from the T/S switch.