JVC CD changer

A friend of mine has a JVC disc changer hooked up to the stock stereo of a 97 mercury tracer, same stereo as a ford escort. The radio has to be tuned to a radio station to listen to cd's, but only one speaker is working. I checked the wiring to make sure nothing was loose, but no luck, any suggestions?

do all the speakers work when the radio is on (not the changer) ?

do all the speakers work when the radio is on (not the changer) ?

YEah, all the speakers function with just the radio, it is only when cd's are playing.

then you really only have two choices ...... either the changer or the adapter box is bad or wired incorrectly

Any idea where to pick up one of those adapters?

I think it comes with the changer