yellow wire

from Jargon File (4.4.4, 14 Aug 2003)

yellow wire
 n.

   [IBM] Repair wires used when connectors (especially ribbon connectors)
   got broken due to some schlemiel pinching them, or to reconnect cut
   traces after the FE mistakenly cut one. Compare {blue wire}, {purple
   wire}, {red wire}.

from The Free On-line Dictionary of Computing (8 July 2008)

yellow wire

   (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}]

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