Per recommendations from this ng, pulled out the turn signal relay, popped the cover off, and examined the solder joints. Everything looked clean and tight so I plugged it back in with the cover off to see if it might work. Worked fine. I snapped the cover back on and it stopped working. Looked inside the cover and it appears to have a support for the board molded into the bottom. Took the cover off, rotated it 180° so the 'guide' was opposite the board, put it back on and it works... Go figure.