Layout of the fusebox varies slightly from year to year. You should get a Haynes or other manual.
The instrument turn signal indicator is an interesting problem. My 74 (and 73) 145e's have the annoying habit where the turn signal indicators would glow dimly while driving, brightening slowly then dimming when I blipped the throttle, only to start brightening slowly again. Sometimes it seemed to drain so much current the ignition would stumble.
I now suspect an incorrectly machined rotor in the alternator that causes a feedback in that circuit somehow that spills over into the turn signal indicators. I moved the alternator from car to car. My problem I can live with.
I would like to figure it out, but other projects outwieght that. Buena suerte.