Hey.. just my .02 ok.. so dont get pissed.. I know how exactly these are
wired.. so here goes.. the back 2 have a "common ground" VW's way of
saving .05 cents.. there is only 1 ground to the back of the stereo. and
the back speakers as you will see have the grounds hooked together.. if
he clips off the back speakers from his new deck it will work perfectly.
the reason his deck does this is its new.. the older decks like the ones
that came in our vans.. didnt care about a common ground.. no fix kit
will fix this.. all you can do is re-wire the speakers. 1990 and up cars
dont have common ground decks and are run perfectly. so you wouldnt have
this prob if yout van was newer. pretty simple fix. as I had to do this
in my van also.. I put 6X9's in my rear hatch =) pretty cool but a pain
in the @$$ to get the wires run through the dang door. but it looks
professionally done and has a lot more sound!

Just my .02
   Jason
85 GL