Main fuse & relay, Ecu 3-amp fuse, Two (2) thirty (30)-way ecu header connectors – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software User Manual
Page 32: Injector_harness_installation, Main_fuse_and_relay, Vehicle_battery_fuse, Header_connector, Injector_harness
BigStuff3 Pro SEFI System
Version 2.1 – February 2011
25
Main Fuse & Relay
ECU 3-Amp Fuse
This fuse protects the ECU electronics.
Two (2) Thirty (30)-Way ECU Header Connectors
To avoid the potential of severely damaging the ECU,
connect the
head connectors to the ECU only after the battery connections
are made
. The two 30-way MWH header connectors are keyed
such that they will only fit in only one (1) of the two (2) ECU
mating-half connectors. To fasten the MWH connectors to the
ECU, use a 1/4-nut driver. Make sure the header connectors, on all
the harnesses, are tightened to 15 – 20 in lbs. Do not over-tighten
the header connectors!! Connect header connector A through K first, the L through Y.
5. Injector Harness Installation – (Black, 10-way Packard
Connector)
Once the main harness is installed and all the connections to it are made, the injector harness can be
installed and connected to the main harness. Each injector connector (on the injector wire harness) is
marked for the cylinder it needs to be attached to. There are specific injector wire harnesses for Chevy
(Chrysler), Ford and Buick V6 engines. The firing order is configured within the GEN3 ECU!
WBO2 &
Coil V-Batt
30 Amp fuse
WBO2 & Coil V-Batt Relay
Injector harness to
main harness
connector (female)