9 firestoneairide.com
INSTALL THE WIRE HARNESS
5
9961 ECU
BLACK
(GROUND)
RED (+)
30 AMP
IN-LINE FUSE
RED (+)
RED/WHITE
8-PIN ECU
CONNECTOR
(COMPRESSOR)
BATTERY (+)
YELLOW
(NOT USED)
9962 WIRE
HARNESS
9523 AIR
COMPRESSOR
BLACK (-)
BATTERY (-)
1
Route the Wire Harness in
the most protected manner
possible, and securely make
all connections as shown.
Why ground the Wire
Harness to the battery?
The ECU needs a good,
clean ground for opti-
mal accuracy. The Air
Compressor can ground
to the frame, but the
ECU cannot.
9961 ECU
LEDs off – ECU off
Red LED flashing – Errors are present
Green LED flashing – Bluetooth not
connected, normal operation
Green LED solid – Bluetooth connected,
Normal operation
ECU INDICATOR LIGHTS (Inside Case)