Look at this diagram from Goldentour. If the colors are correct, then the grey wire should go to the voltage regulator.

http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=1043318&page=&view=&sb=5&o=&fpart=all&vc=1


"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles