Recently I've been into the idea of hooking up a Bluetooth receiver to my car stereo via my car radio's aux input. I got a Bluetooth receiver module from an old Bluetooth speaker that I had laying around. I disconnected to speaker and, not surprisingly, it was a mono speaker output on the circuit board. I took an aux cable, cut it open, wrapped the left and right together and soldered it to the positive output and soldered the ground wire to the negative output on the board. I plugged it into my car, connected to the module with my iPhone and played Spotify... It worked, but audio only came through the left side of the stereo car system.
My question is: Is there anyway to play the mono sound through both stereo speakers?