Brake Light on Pass Side not Working

1st Time Post Hi
67 Chevy Van

Tail Lights work (both sides)
Turn Signals work (both sides)
Bulbs are good (both sides)

Pass side break light doesn't work
Pass side rear is the only hazard light that does not work

Bought a Harbor Freight Multimeter to test for shorts, but I am not even sure I am using it right.

Frustrated

Thanks

#1= these take a # 1157 bulb- check-making sure!!!!!!!!!!!  the bulb is -IS!! installed correctly!1 as there are 2 offset prongs that locate the bulb in the socket!! They can be forced into the socket incorrectly!! also look inside the socket for contacts that are still spring loaded & not sticking as to not allow curreb=nt to 1 side of bulb!

i can double check, but would the running light and turn signal work if only one of the contacts touched?

just trying to understand your help...
you say "measure it" , "then, "once you find it"
i am not following
thanks Gonernor...

Donivan is correct! wiring code is = left stop=yellow right stop=green brown is tail lights hot feed =both sides.

,,,,,,,I guess the simple answer would be,,,,,the rear turn signal and brake lights get their  orders from the turn signal switch,,,,,,if ONLY one of the brake or one of the turn signals in the rear dont work,   THEN,,, the turn signal switch is not working right....

Donnivan speaks great truth!

If you get hazard OR turn OR brake (without any other strange behavior), it proves the bulb and circuit.
It's gotta be the turn signal switch on the column.

ok i have got the steering wheel off, to access the switch.
please tell me where to put the probes from my meter.
one on the green wire (right rear light)?
and the other on...? the white wire from the stoplight switch?
using a multimeter, no light.
do i use the volt setting, or the ohm setting?
do i turn the ignition key on for power?
thanks

i turned on 4 ways
red probe of meter to green wire
black probe to ground
got a reading of 0

tested the yellow wire and got the same result

tryied again with key and turn signal on
the meter never settled on a reading

i appreciate your knowledge that the turn signal switch is the problem, but i would also like to understand the testing and proving procedure.
thanks

#1= always test the meter or test light! verify its good & operational. #2= the test light must have a GOOG!!+Proven =Ground!! Hook black clip to a ground & verify with probe to a KNOWN 12 v source its working fine? #3= turn key "ON"! then turnsignal switch to left & check wires - then to right-check wires-should have test light blinking when turnsignal blinks? -Try new =Flasher also?? Get a ="Heavy duty Flasher " = possible its a bad flasher unit also in fuse block?? Replace! & retest all.

ok here is the update...

i took the turn signal switch off and took readings on all the wires.
everything seems to check out ( i can provide the specifics if it helps)

the brake lights only work, if the left turn signal is on (with or without the key on)

the 4 ways don't work in the back, unless either the left or right turn signal is on.

my next step is to check the back end for some wrong wiring.

if you see something i don't, please let me know

THANKS

Ok governor, as per your instructions...

4 way switch on, no key:
Front two signals flash
Dashboard signals flash
Rear signals DO NOT flash

Press on brake ( only):
Voltage is 12.3
Rear brake lights DO NOT light

yes i did all that getting the individual wires out of the plastic horseshoe yesterday. i also cleaned the contacts. i showed continuity for each wire

white to green with left turn signal on
white to yellow with right turn signal on
purple to light blue with left turn signal on
purple to blue with right turn signal on
white to brown with 4 way flasher on

anyway, back to today...
i am not getting a reading on either the yellow or green wire
i did notice that my meter has lights that flash in sync with the flasher on the blue, light blue, and brown wires.
i also pushed the hazard switch many times, but no change

Ok gov, all those colors I gave you were for continuity
Now back to your plan...

While pressing on the brake...
White, voltage in 12V
Green, voltage out 0V
Yellow, voltage out 0V

you know i appreciate ALL your help.
i went ahead and ordered a new switch.

THANKS