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Terry @ BMS Terry @ BMS is offline
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Join Date: Jan 2008
Default JB3->JB4 Harness DIY - 03-27-2014, 02:44 PM

Photo DIY for JB3->JB4 harness rewire in photos below.

JB4 Pin Out Reference:

Large black subconnector:
yellow: slot 10 (boost, yellow wire)
black: slot 32 (ground, red/black wire)

White subconnector:
purple: slot 7 (boost solenoid 1, white/gray wire)
green: slot 14 (boost solenoid 2, white wire)
gray: slot 9 (fuel pressure, yellow/red wire, connect on all models)
Red loom previously from large black connector: slot 17

Small black subconnector:
orange: slot 6 (oxygen sensor 1, yellow/white wire with 525 stamped on insulation)
blue: slot 7 (oxygen sensor 2, yellow/white wire)

Grey subconnector:
dark red: slot 7 (throttle position, yellow/white wire. May be blue/white on 535)
White loom previously from large black subconnector: slot 14
Brown loom previously from large black subconnector: slot 1
Attached Images

Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

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