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COMPRESSOR INSTALLATION: Fig. 3 & 4
7. Install the compressor in a dry interior location. 

IMPORTANT: The compressor 

should not be mounted further than 30 inches from the trumpet to ensure best sound.
8. To secure the compressor, drill one 3/16” 
hole. When possible, mount the compressor 
vertically (air outlet on top). Install the head 
of the bolt into the mounting bracket’s slot 
on the side of the compressor. Secure 
the compressor using the lock washer/nut 
provided as shown in Fig. 3.
9. Using the plastic tubing provided, cut to 
size, connect the compressor to the two air 
inlets using the “Y” connector provided as 
shown in Fig. 4.
WARNING: Avoid making any kinks or 
sharp bends in plastic tubing that can 
reduce air flow and alter the horn’s sound. 
For best performance and sound always 
keep the plastic tubing as short as possible.

WIRING: 
ELECTRICAL CONNECTIONS FOR USING A NEW HORN BUTTON SWITCH 
Fig. 5
10. Install the horn relay provided, in a dry interior location with the terminals facing downward.
11. Connect relay terminal 87 to the compressor’s positive (+) terminal. Use 16-gauge wire or heavier.
12. Connect relay terminal 85 to the horn button switch terminal. (Horn switch not provided). 
13. The horn switch’s other terminal is connected to negative (-) such as the (-) battery post or any clean metal 
negative surface. Use 18 gauge wire or 
heavier.
14. Connect relay terminal 30 & 86 to 
positive (+) 24-volts such as battery, 
alternator, fuse block or etc., using 
16-gauge wire or heavier. 

IMPORTANT: 

Protect the electrical circuit with the 
fifteen (15)-amp inline fuse provided. 

WARNING: The inline fuse must be 
connected directly to the power source. 
15. Connect the compressor’s negative 
(-) terminal to boat’s battery, (-) post or 
any clean metal negative surface. Use 
not less than 16-gauge wire.

RECAP OF RELAY TERMINAL 
CONNECTIONS:

 

Relay terminals 30 & 86: the two terminals are connected to 24-Volts (+) positive, using the 15-amp inline fuse. 

Relay terminal 85: is connected to horn switch.  

The horn switch’s other terminal: is connected to negative (-) battery post. 

Relay terminal 87: is connected to the compressor’s (+) motor terminal.  

The compressor’s negative (-) terminal: is connected the boat’s negative (-) battery post.

Fig. 5

86

air 

inlet 

tubes

86

15 AMP
FUSE

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