Brake lights not working

I'd definitely vote: Turn Signal Switch (TSS).
a) It may have been fried (I know I'm guilty of it)

b) It may also be due to a previous owner doing some re-wiring. So check that the TSS wires match.

c) To Compound matters, Some aftermarket TSS wire colors don't match. But fear not, here is a link from Sweptline.org (scroll down to the 'Eighth Topic')
c1) Note that the Author of that thread also found a source for TSS at a reasonable price (anytime Sweptline guys give a parts source, you know the price is good...'cause we're really cheap, even more than A-Body guys - I'm actually both). Oh, the company name is 'Shee-Mar,inc.'

d) The problem could be any combo of the three + more, esp. the Bulkhead Connections (get rid of as many as you can - at least the Ignition & Lights)

Good Luck - This part of owning a Mopar is the absolute worst part of these cars. I'll take Rust issues over Elec, anyday.