Well consider the turning signal switch yours
I have a 75 as well I am trying to think right off the top of my head I know that the last four fuses (closest to the firewall) are for the headlights, I was working on my headlights before I was deployed.... seems that I have a short or something somewhere I only have high beams right now. Thats how I came to get the extra switch I thought it might have been the turning signal switch, cause before my high beams used to be intermitent. It's a friggin nightmare!
I was thinking of completely rewiring the truck with a painless kit when I do the V-8 conversion.....who knows I might still do it
That is if I stay in Wa. a little longer, if not then she goes up for sale before I go to Hawaii.
Later
Husker