Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 7)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 7
The gray 2-way connector kit below is the mating half connector to cam input. Fore more information
on how to wire the cam sync go to the
Cam section below.
The black 2-way connector kit below is the mating half connector to crank input. Fore more
information on how to wire the crank input go to the
Crank section below.
4. Main Wire Harness Installation
To improve the overall wire harness installation process, the
harness was manufactured with identification labels at the end of
each wire or connector to ensure that connections are properly
made. The main wire harness has two halves; one half is intended
to be located inside the vehicle with the ECU, the other half
connects to the sensors in the engine compartment. The two
halves of the harness are separated by a firewall grommet designed
to fit snuggly in a 2-1/8” hole in the firewall.
The best location for the hole is in an unobstructed location, on either side of the engine closest to
where the ECU will be mounted in the passenger compartment. Care should be taken to keep the
harness as close to the center of the vehicle as possible. Locating the hole too far away from the
vehicle center may affect wire lengths that connect to sensors on the engine. Once the main harness is
installed, the connections need to be made to sensors, the ECU, etc. The paragraphs below describe
how and where each connection should be made.
Firewall grommet
Mating half connector to
the “Boost” connector on
the main wire harness.
Used for the
“Data
Trigger” / “Timer Enable”
(wire) input.
Use
terminal A
Mating half connector for
the Cam input (cam
sync) Mating half connector for
the crank input from the
distributor or crank
trigger sensor
Terminal
location
“A”