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Check the common ground coming out of the R/F head light ( white with black stripe) follow it to ground. One of these two grounds seems to be lacking a good connection.
The ground for the right front turn signal also white and black meets with the ground for the headlight in a junction box and goes to the same ground.
Sorry I can't post the schematic it is in PDF and the site doesn't support it.
If that isn't the problem there is a solid state circuit called the combination meter, that may be causing the problem. That is the only other thing I see that the turn and headlights have in common.
I don't think head light switch because it has nothing to do with the turn signals
That combination meter on the other hand is solid state and could possibly been killed in the flash -power surge ( transistors don't like reverse polarity)
If you have further questions please post back.