(IBM) Repair wires used when connectors (especially ribbon connectors) got broken due to some schlemiel pinching them, or to reconnect cut traces after the field engineer mistakenly cut one. Compare blue wire, purple wire, red wire. [Jargon File]
Supposing Honorable like to see these yellow wire envelopings.
"If you follow the yellow wire you'll come to B Battery," said Wilde.