
BigStuff3 Pro SEFI System (LS1)
Version 1.0 7
Harness
Label
Color/Connector
Label
Definition
Connect To Further Details
Packard connector
with a purple seal
calibration
port that
allows the
ECU to
interface with
an external
computer
of the RS-232
communications
cable (supplied)
to the ECU and
the other end to
the serial port of
an external
communication between
the BigStuff ECU and an
external Personal
Computer (PC) running
the BigComm software.
Click CalPort for further
information.
Clutch or trans
brake switch
vehicle
connector with a
single red and white
drive
positive side of
the fuel pump
directly to the fuel pump.
A relay must be used.
connector with a
single black wire.
drive Ford
negative side of
the fuel pump
relay.
directly to the fuel pump.
A relay must be used.
connector with a
single red wire.
cooling fan
connection
negative side of a
cooling fan relay.
directly to the fan or
positive side of the relay.
A relay must be used.
Packard connector
with a purple seal
shaft
connection
LS1 crank shaft
sensor located by
supply input
source that is
“live” when the
ignition key is in
the “crank”
titled “Ignition
Connection” for further
relevant information.
Switched_Ignition
connections)
terminals. Two (2)
red wire terminals
and two (2) black
wire terminals.
Negative
Battery
Connections
battery only!
titled “Battery
Connections” for further
relevant information.
Battery_Connections
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