Rear lights...whats normal?

So far as diagrams, go to MyMopar and look for a 71 service manual. You may have to settle for Dodge vs Plymouth.

With the hazard flashers on, I believe if you apply the brake they stop and all 4 corners light up. If you are having trouble with turn signals and have eliminated power/ flasher as a prroblem, don't forget that they are tied in with the hazard switch, which is of course a part of the TS switch. It can however introduce problems.