no no no. There are only three speaker wires that go to the rear of the bus.
These are a common and a left and right channel. If you have a new stereo,
it will say to not combine the commons. Bad, really bad to do, so I am told.
You will need to run new wires to the rear of the bus. Bummer- a good lesson
in patience.  The front speaker wires are (in my bus at least) four separate
wires.

I was able to run the rear speaker wires under the carpet and then in the
wall panels, up the rear column and across the top. I used the speaker wire
to force itself up the wall.

Good luck, we are all counting on you; no pressure.

-Matthew
84 wolfsy
97 Kenwood CD player purchased at Onsale.com for 100$!!!