not an a-body but need help please

When you troubleshoot stuff like this, you need to find a place to "divide" the problem, I.E. is it "this half" or "this other half."

One place in this case is to dig out the connector at the steering column. Here's how this works

Your brake light switch does NOT feed the lamps, but rather goes THROUGH the TS switch, so that when you, say, turn left, the TS switch disconnects the LEFT brake lamp, and hooks it up to the flasher.

So probe the connector.

Take a test lamp, ground the clip, and make sure "things" work:

Probe the connector at the steering column, check out the LEFT one first, because you think it works

Your tail/ turn/ stop lamps are:
brown is tail
yellow is left turn/ stop
green is right turn stop

So probe the connector and find a yellow wire (or yellow with tracer) and probe your lamp in there

Hit the brakes and make sure you get a light. Turn on the key, select left turn, and make sure the lamp flashes

Now you know that much works, probe the RIGHT side, which is the green wire.

Once again, hitting the brake should light the lamp, and making a right turn should flash the lamp

If you don't get a brake light, you probably have a bad signal switch If you get a brake light but no flash, you MAY have a shakey flasher, a shorted bulb, or bad ground at the socket in the rear. THAT IS BECAUSE many flashers will not flash without a "proper" load. That is, in other words, if you took a perfectly working system and simply pulled out either a front or rear lamp, it MIGHT stop flashing on that side.

Here's at least one diagram:

http://www.mymopar.com/index.php?pid=24