I have an fm transmitter which has a 4 wires of the colour red blue white and green. Also I want to join this to an aux cable which has red white and an unprotected silver cable. Which wire do I join to which one.
There is no color code standard for the transmitter (contact the maker or look at the unit itself). The aux cable would be red = right plus, white = left plus, and the silver wire is a common ground or negative for both right and left. I would try connecting the red to red, white to white and both blue and green to the silver.