Does anyone know which wire is the positive speaker wire in the left door. One is red, the other is yellow. 1995 900SE convertible

Hi,

To find out which is positive connect a low voltage battery to the speaker wires, 9V.
The speaker diaphram should move in or out depending on the positive connection. If it moves out then which ever wire is connected to the positive on the battery is your + on the speaker.

Good luck

Des