Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 8)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 7
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. The CalPort allows for
communication between
the BigStuff ECU and an
external Personal
Computer (PC) running
the BigComm software.
Click
CalPort for further
information.
2-Step Single yellow wire 2-Step trigger
function Clutch or trans
brake switch Two_Step_Trigger
Tach Single green Wire Tachometer Connects to
vehicle
tachometer Tach
HS GM FP 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.
Fuel_Pump
LS FP Single lead Packard
connector with a
single black wire. Low Side
drive Ford 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.
Fan Single lead Packard
connector with a
single 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.
Fan
LS1 Crank
Black 3-way
Packard connector
with a purple seal LS1 Crank
shaft
connection Connect to stock
LS1 crank shaft
sensor located by
starter motor LS1_Crank_Sensor
+12V Switch Single pink wire Switched 12V
supply input Connect to a 12V
source that is
“live” when the
ignition key is in
the “crank”
position See paragraph below
titled “Ignition
Connection” for further
relevant information.
Switched_Ignition
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
relevant information.
Battery_Connections