
BigStuff3 Pro SEFI System (LS1)
Version 1.0 9
Harness
Label
Color/Connector
Label
Definition
Connect To Further Details
Ground
Black 3/8 ring
terminal
for LS1 Coil
equally adequate
l_Connections
O2
connector with gray
locking mechanism
Wide band O2
sensor.
details.
Wide_Band_O2
N/A N/A N/A
N/A N/A N/A
Connector
N/A
link to photo
in “Further
Details”
Control Unit
(ECU)
The paragraphs below further support the information outlined in the table above.
Calport [(software calibration cable interface connector) – (3-way Black Packard
Connector)]
Do not connect the communications cable until all the hardware and
software is installed. See the BigComm Users Instruction Manual
for further information.
Back_to_Calport
2-Step Trigger (Yellow wire)
Connect this wire to the clutch or trans brake switch. If 12Volts are applied to this wire and the
2-Step RPM criteria are met the ECU will maintain the
engine RPM to the 2-Step limit. For more information on
configuring the 2-Step function go to
Back_to_Two_Step_Trigger
Packard connector
AMP RS-232
connector
(supplied)
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