The vehicle battery only – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software User Manual
Page 9
BigStuff3 Pro SEFI System
Version 2.1 – February 2011
9
Harness
Label
Wire
Color/Connector
Type
Label
Definition
Connect To
Further Details
Calport Black
3-way
Packard
connector with a
purple seal
The
calibration
port that
allows the
ECU to
interface with
an external
computer
Connect one end
of the RS-232
communications
cable (supplied)
to the ECU and
the other end to
the serial port of
an external
computer.
Click
for
further information.
Primary Fuel
Pump (LS) –
Must be wired
as the
Primary
pump!
Single lead
Packard
connector with a
single
black/white wire.
Low Side
drive
Connect to the
negative side of
the fuel pump
relay.
Do not connect this
wire directly to the
fuel pump. A relay
must be used.
Secondary
Fuel Pump
(HS)
Must be
wired as the
Secondary
pump!
Single lead
Packard
connector with a
single red and
white striped wire
High Side
drive
Connect to the
positive
side of
the fuel pump
relay.
Do not connect this
wire directly to the
fuel pump. A relay
must be used.
Fan Single
lead
Packard
connector with a
single black/red
wire.
Engine
cooling fan
connection
Connect to the
negative side of
a cooling fan
relay.
Do not connect this
wire directly to the fan
or positive side of the
relay. A relay must be
used.
Points
Single white wire Connection
for inductive
pickup ign.
Only to the MSD
system white
points input wire
12V Switch
Single pink wire
Switched 12V
supply input
Connect to a 12V
source that is
“live” when the
ignition key is in
the “start”
position
See paragraph below
titled “Ignition
Connection” for
further relevant
information.
Battery (4
connections)
Four (4) 3/8” ring
terminals. Two
(2) red wire
terminals and two
(2) black wire
terminals.
Positive and
Negative
Battery
Connections
The vehicle
battery
only!
See paragraph below
titled “Battery
Connections” for
further important
information.