Old age. I can't hear the turn/emergency flasher anymore unless the engine, radio, and heater are off.

I've looked everywhere I can think of for a loud flasher. Finding loud flashers is easy, but can't find one with the required 4 terminals.

Can anyone direct me to a loud 4-terminal flasher?

In hopes that a new regular flasher would be louder than this 15 year old one, I installed one from NAPA and it is not as loud as the old original flasher