Just remember 'what all' goes into and out of the TS switch and make yourself a truth table
Flasher power into the switch, and tail lamps do not go through the switch
There should be no hazard setup that year unless it was added as a stand alone accessory
Switched brake light power into the switch.
No ground involved with the switch
Output are the stop/ tail, so left turn/ stop and right turn/ stop
Front left turn
Front right turn
If you don't know the colors you can identify the rear by checking continuity. With the switch in neutral, the only wires which have continuity are the brake lights in and the two rear lamps out
Then go from there. With the switch in left, the front and rear left will be connected to the flasher wire.
And you can then eliminate them from there
Along with ground problems, don't discount an internally shorted bulb OR AN INCORRECT bulb, or a socket with the contacts 'disoriented' so that it contacts the bulb wrongly
Ungrounded sockets can drive you nuts. To find, apply power (flasher, whatever) and stab a meter probe into the socket metal, and the other probe to a good ground. If you have to, "rig" a long piece of wire and a good battery clip to battery NEG, etc.
