Williams main line wire on many of their machines is too small. Check the
wire that connects the transformer to the main fuse. All the current for
the machine goes through this wire. If this wire is a single 18 gauge wire,
replace it with either a double-strand of 18 gauge, or just use 14 gauge
instead. If this wire is the bottleneck on the game, this change will
improve playfield action.
Tim Arnold pinGame journal, #25 September 1993 pp 37.