Two wires on one GI pin

On the original IDC plug a wire sometimes loops from one pin to the next. When converting to crimp pins, join the two wires into a short pigtail on one pin and cover the joint with heat-shrink.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• J115 wire colors on games before Twilight Zone
• Thin wire on J120 adds to burning on WPC-S
• J115 wire colors from Twilight Zone on (Corvette example)
• Coils pulse and backbox flashers too bright: flasher power wire on J132
• Lower pop locks on at power-up: J124 plug fitted on J128
• Backglass cannon fires with the diverter instead of on its own: plug swapped
• DMD shows a few dots and a coil fuse blows after reseating boards: ribbon off one row
• Backbox wheel and Ferris wheel motors dead with no 12 V: J116 left unplugged

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)