Mustang Diagrams - Fuse Identification, Wiring Schematics 1979-2017 Ford Mustang Diagrams & troubleshooting documentation. Aftermarket Part Reviews, General discussion about Muscle Cars Standard Wire And Color Codes - Gary's Garagemahal (the standard wire and color code charts The following is a Ford publication that shows the wire colors used for each circuit as well as the circuit numbers for them. But, note that this document covers a wide range of years and vehicles, so your vehicle might not have all of the circuits shown. 88 mustang fuel pump not priming. yea. another one The feed wire from the fuse link (orange/ light blue wire) goes to the fuel pump relay contacts. When the contacts close because the relay energizes, the power flows through the contacts to the fuel pump (light pink/black wire). Notice that pin 19 on the computer is the monitor to make sure the pump has power.