They certainly should do.
If not, the vehicle should not be driven until they function correctly.
Put the car in drive, unbuckle, and floor the gas pedal. The lights will turn on as needed.
Possibly a bad ground in the rear wiring harness somewhere.
Replace headlight switch- dimming rheostat may be loose
Is that a question? They work because that's the way your terrible car was designed to work? Do you mean HOW do they work?
Check the fuses
Underneath the glove compartment. By that, I mean you have to pull out the plastic lining in the glove compartment. Stupid, huh?
just had something similar like this done, they had to replace the wire harness inside steering wheel, because its all electrical. one of my turning signals and left side of brakes and back window light would not work.
Where is the fuses for the brakes lights Buick Rivera 1970
There seems to be a safety switch system, the brakes must be applied to release the transmission from park. Don't know location of linkage, if mechanical or electrical. Assembly could be in transmission of console. If no joy, then check wiring and connectors. Do brake lights work - then brake switch probably ok.
no
Yes, but the signal lights are the wrong shape.
With the lights on pull on the turn signal lever. High beams should come on. Pull again and they should go off.