I've recently acquired a 91 FLHTC and I'm having a problem with one of the turn signals. The right turn signal and hazard lights flash correctly but when I activate the left turn signal it just comes on steady and doesn't flash. Since the left side will flash when the hazard lights are on, I know that everything physically works, it just won't flash on the left turn signal.

My two questions are these: Does it sound like the turn signal module is bad? And: I eventually want to upgrade the rear turn signals to operate as stop/turn/tail lights. If I buy the module to make them the S/T/T, will it also fix my current problem?