Here's a heads up
I found what might have been the problem.
You may want to check your PCIII
wiring harness along its routing.
A week or so ago, I got stranded by my PCIII
Turns out that the PC wiring harness had worn through the wire jacket at the point where it goes under the tank. Apparently, the bare spot shorts out against the tank.
My guess is that the micro-vibrations from the tank against the wire just abrade through over time.
The fix is very easy. items needed:
-some electrical tape
-12 inches of clear PVC tubing 1/4inch or so in diameter, just eyeball it. But don't get it too big. *
(cost approx 15 cents)
Seal the area well using electrical tape.
Using a razor knife, slice down the length of the pvc tubing.
Apply it over the harness.
Note: if you have trouble getting the tubing over the harness, just bend it over backward gently and it will open right up.
Run a length of tape down the slit to seal it.