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Wiring Harness
⅜" socket, regular head screwdriver, slip joint pliers, ⅛",
electrical tape, wire cutters.
Misc. electrical components, wiring harness mounting hardware, insulated clip hardware
If during this section, you decide to cut your harness, wait until after the car has been started then
remove sections one at a time, starting the car after each cut to make sure it runs. Helm electrical
manuals for the model year you are using are invaluable. They cost between $30-$55 ea. but are
well worth the money.
If you did not take the harness out of the car yourself, when connecting the plugs together, check
the wire colors going into and out of the plugs to make sure that they line up and are the same
color. The only plug that may not be the same color is the fuel tank harness. All other plugs that
go together should be matching in color and shape or they will not connect. Different color
plugs means you may have a different year harness than the rest of the harness that you have and
could cause complications later when trying to start the car.
If you decide not to use the Mustang chassis harness because there are so many extra wires, the
Factory Five chassis harness is a good alternative, it comes pre-loomed and labeled. It can also
be used in combination with the Mustang engine harness if running fuel injection.
There are three ways to wire an EFI engine. One is to use the entire Mustang harness and
transplant it. Another way is to use an engine harness from the Mustang and splice the power
leads into an aftermarket chassis harness such as the FFR chassis harness using Chilton's or Ford
wiring diagrams. The third way is to use an aftermarket chassis harness and an aftermarket stand
alone engine harness.
www.helminc.com
189
www.factoryfive.com
3
/
" drill bits, drill, #8 nut driver,
16
508-291-3443
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