i was trying to fix the r. rear turn signal on a co-workers 84 245dl today and have a question for yall. his r. rear signal works on and off, his garage said the whole signal assembly needed to be replaced. i had a spare from my recently junked 245, i put it in hooked it up and everything worked fine for the first few minutes. when i had everything put back together, we double checked all the lights and the signal wouldn't work.

i double checked the bulbs, bulb holder and the wire connections which i cleand off prior to instal. pretty sure its not the tail light assembly now, what else can i look for. is there a relay or something that could be dying? or just a short somewhere in the rear harness. he was rear ended a few yrs back and had the rear hatch replaced. any ideas? all the other turn signals work fine.