2581 Installation Instructions
8
INSTALL THE WIRE HARNESS
4
SUP
AS-1
AS-2
EXH
SUP
AS-1
AS-2
EXH
ECU
RED (+)
20 AMP FUSE
RED 12V (+)
RED/WHITE
ECU
CONNECTOR
RELAY
CONNECTOR
(COMP)
BATTERY (+)
YELLOW
+12V IGN
WIRE
HARNESS
BLACK (-)
BATTERY (-)
OPTIONAL: Use supplied
Fuse Tap. See important
information on the Using
the Fuse Tap sheet.
BLACK
(GROUND)
RED (+)
AIR COMPRESSOR
SEALED
RELAY
Drill 3/16”hole in suitable location on
vehicle (or use optional Firestone Air
Accessory Mounting Kit).
10-32 x 3/4”
MACHINE SCREW
10-32
NYLOCK
NUT
3/16” FLAT
WASHER
1
Determine a suitable location
to mount the Sealed Relay,
assuring it will be within
reach of the relay connector
on the Wire Harness.
2
Securely fasten the Sealed
Relay as shown.
3
Route the Wire Harness in
the most protected manner
possible, and securely make
all connections as shown.
RELAY
CONNECTOR
Fully seat until
male tab clicks
securely.
SEALED
RELAY
TAB CONNECTOR EXAMPLE
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.
