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Dual Trumpet Mini Air Horn
10108 & 10121
6
Compressor Wiring
NOTE: The following items are needed to complete the wiring of the horn and are
NOT included: horn button, 20-amp fuse and fuse carrier, two 1/4” female quick-
connect tabs and the proper length and gauge of stranded wire (see Wire Size
chart).
1) Select the proper stranded wire size for the length of wire you will need from
the Wire Size chart.
2) The length of wire should be sufficient to allow enough slack to prevent
undue tension at the connection points.
3) Connect the wires as shown in the wiring diagram. It is recommended that
the quick-connect tabs be soldered to the stranded wire for the best and most
reliable connection to the compressor. Suggestion: Use the Marinco Direct
Connect Multi Connection Battery Terminals (Part #12VTR) to connect the
wiring to the battery.
4) If horn volume is weak, recheck all the wiring and air hose connections.
Wire Size Chart for 12V Installation
Length of Wire* Wire Size
0-20 Feet (0-5 Meters) 14 AWG (1.9 mm)
21-30 Feet (6-9 Meters) 12 AWG (2.3 mm)
31-50 Feet (10-15 Meters) 10 AWG (3.0 mm)
51-80 Feet (16-24 Meters) 8 AWG (4.0 mm)
Over 80 Feet (Over 24 Meters) 6 AWG (5.3 mm)
To replace an electric horn with this air horn you may need to replace the wiring with a
heavier gauge wire and fuse that will carry 20 amps as shown in the Wire Size Chart.
AWG: American Wire Gauge
*As measured from the battery to the compressor and back to the battery (round trip).
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