T.P.S. positive wire??

These might help you.

http://forums.stangnet.com/showthread.php?t=482410&highlight=tps+wires

http://www.muscularmustangs.com/tps.php

Direct quote from the 2nd link:
After testing the wires we've figured out which ones are which. They are as follows: The first grey wire is the ground, the second grey (with white stripe) is the test wire, and the brown wire is the 5v source.
So to test a 94-95 car you would put the negative lead on your voltmeter to a good engine ground or the first grey wire. Then you would put the positive voltmeter lead to the middle grey with white stripe wire.
 
Mine were like this for my Fox swap...
S/N Fox
RED/GRAY..............BLACK......(Pos)
GRAY/WHITE..........GREEN......(Neg)
BROWN/WHITE........ORANGE