Large-scale Duster electrical issue

I *think* the turn signal flasher unit in 73 and 74 may still be in a clip near the ashtray. When its in the clip the sound is amplified a bit.
At least on the late 60's cars, the hazzard flasher is left of the lower steering column.

Hazard wiring changes over the years, but somehow it still needs to go to the turn switch to get to all the turn signals and indicators.
Late 60s it also is over riden by the brakes. I dont know if the changes or not.

Ammeter. With a few exceptions ammeter should only be connected in-line as part of the battery charge/feed wire.
Exceptions I can think of are clock, covertible top on the battery side some years.
If your '74 has or had an rear window defrost grid, then it may have the heavy duty wiring option.