As noted by Marshall, I used the original ground wire to pull two new wires to the rear of our Westy.  Our set-up is a little different than most, as A/C vents take up the normal in dash radio location, we installed our CD/radio on the headliner.  I only had to run wires from the top of the passenger door back.  But I did succesfully run other wires up from behind the dash through the drivers front pillar to the space above the drivers door (the front speaker wires, power for the radio, etc.).

Mark
82 Westy
with heat(thanks Jack and Bob)
and tunes!

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