help electrical problem!

I learned early on how to deal with tail lights. It "used to be" that some of the GM stuff had some of the lights IN THE trunk lid. You can imagine. You used to see a lot of 60--65 Chivvies with odd crap happenin' wid' mid' da' lights'n stuff.

Me 'n the 63 circa May 1970, headed S from the N to NAS Miramar