Installation manual

Ford Racing Technical Support (800)FORD-788 - 10 -
M-12071-A50
REVISION 2
8.0 WIRING CONNECTIONS
This harness has been designed to simplify the installation process of fuel injection. There
are numerous enhancements intended to require minimal effort by the installer. With the
exception of the main battery leads, all of the required harness connections have been
located in a central location within a single 9-Pin Disconnect located near the computer.
Additionally, all of the fuses, relays, and enhanced features have been conveniently located
in the Fuse/Relay Control Module (FRCM).
8.1 Locate the Single 9-Pin Disconnect (Page 6, Connector #25). This EFI Wiring
Harness kit includes a mate to this connector which includes 8 wiring pigtails. This
is where you will need to make the connections for the harness.
8.2 You may use the diagram on page 11 as a reference for the following connections:
A. Pin 1 (Pink/Green Wire), and Pin 2 (Pink Wire): These two wires will need to
go to the “Check Engine” light. This is a mandatory connection and is required
for the computer to do an initial ‘Self Test’ upon starting the engine.
B. Pin 3 (Red/Blue Wire): Connect this wire to a 12V ‘START’ source, meaning
that voltage is present only when the starter is cranking
. This connection is
used to tell the computer and the TFI module when the engine is being started,
and will initiate a different strategy in the computer when voltage is applied.
C. Pin 4 (Black Wire): Connect this wire to a ground source. A body ground is
acceptable for this connection, though you should make sure that the area is
free from rust or paint. This connection is for grounding the case of the
computer and also for grounding the shielded wires leading to the TFI Module.
D. Pin 6 (Green/Yellow Wire): This wire connects to the positive side of the fuel
pump. Connect the negative side of the fuel pump to a ground source. If you
are using a fuel pump which can draw more than 20 amps, you should use an
external fuel pump relay, and use this wire as the trigger wire to that relay.
E. Pin 7 (Purple Wire): If your engine is equipped with air conditioning, connect
this wire to the dash control A/C switch. This wire should have power when the
A/C is on. This will engage the A/C compressor clutch, and send a signal to the
computer to maintain proper idle speed to compensate for the increased load
which will be imposed on the engine from the A/C compressor.
F. Pin 8 (Red/Green Wire): Connect this wire to a SINGLE SOURCE which will
have 12 Volts when the key is in both the ‘Start’ (cranking) AND
in the ‘Run’
positions. This is the primary circuit which will provide power to all of the relays
and to the ignition system.
G. Pin 9 (Tan/Yellow Wire): This wire is the tachometer lead. This is not a
mandatory connection.