OK, turns out one of your suggestions was right on. I had amber 1156 bulbs in the front. Changed them to clear 1157 and they work fine now. Except now...
With headlight switch on off position, doors closed and courtesy lights off, the rear tail lights and arrows are on, and brightness adjustable via the headlight switch!
68' Firebird 400 convertible, numbers matching, solar red w/ deluxe parchment interior. 66' Pontiac Ventura Hardtop 66' Pontiac Catalina Convertible