IIRC the black wire on the connector is the ground wire, follow the wire harness back until you find where it attaches to the frame. BTW I had trouble with the power feed on my connector on my 94. It was corroded and dropping voltage.
"Nelly Belle" 95 XLT SC SB 300 4x2 5 spd 244k
"If women don't find you handsome at least let them find you handy" Red Green