Fast 30400-KIT-EZ-EF Instructions Manual - page 21
21
problems with electrical noise. These kinds of problems are difficult to diagnose. The wires
may be extended if needed using automotive grade 10 gauge (or larger) wire.
Yellow ring terminals are included for making the battery connections. After the ring terminals
have been crimped on, use a heat gun or other heat source on the insulation to shrink it and seal
it to the wire.
Be sure the “12V SWITCHED” wire is connected to a source that is hot with the key in the
On/Run and Crank positions. Losing the 12V switched source during cranking can lead to a no
start condition and other problems. The green “SW IGN” LED on the ECU indicates power on
the “12V SWITCHED” wire and should stay lit during cranking.
Do NOT connect the “12V SWITCHED” wire to the positive side of an ignition coil.
A butt splice is included for tapping into an existing 12V switched wire if necessary. After the
splice has been crimped on, use a heat gun or other heat source on the insulation to shrink it and
seal it to the wire.
The main connector on the wiring harness has an integrated retaining bolt that secures the
connector to the ECU. A 4 mm hex key is included with the kit for tightening this bolt.
The wiring harness should be kept away from ignition components (ignition boxes, coils,
distributors, etc.) as much as possible. There will be places where plug wires run past the
wiring harness. That is often unavoidable and not a problem. Just try to keep them – or other
parts of the ignition system’s wiring – from running parallel to the wiring harness. And do not
bundle the wiring harness together with other “noisy” wiring in the vehicle.
As with any wiring, it is good practice to avoid routing the wiring harness around sharp edges
or near high temperature components such as headers.
A length of loose, braided wire covering is included. It can be used as needed to protect the
loose wires in the wiring harness once they have been routed and cut to length. After cutting
the wire covering, use a cigarette lighter or other heat source to seal the cut and prevent fraying.
The fuse on the red “BATTERY POS” wire is 25A. All other fuses in the harness are 1A.
The connections on the wiring harness are all clearly labeled. They are connected as follows:
LABEL
PHOTO / LOOSE WIRE COLOR
CONNECTS TO…
12V Switched
Pink
Switched ignition source (hot in On/Run and
Crank). This turns the ECU on and off. Do
NOT connect to the positive side of an
ignition coil.
A/C Input
Gray
Air conditioner switch. Feeding power to this
wire tells the ECU that the air conditioner
has been switched on. Idle speed will be
bumped up and the fan outputs will be
activated.
Battery NEG
Black
DIRECTLY
to negative post of battery.
Battery POS
Red
DIRECTLY
to positive post of battery.