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VXO8350B/4124B 

INSTALLATION GUIDE

 
 

 

PAGE 5 of 6

 

 

ELECTRICAL CONNECTION 

COMPRESSOR 

  The red wire of the compressor should be connected to (+) 12-volt power source. 

IMPORTANT

: To prevent 

the compressor from over running and possible damage due to an air leak, 

connect the compressor’s red wire 

to a power source in the vehicle that only gets power wh

en the vehicle’s ignition is on. Recommended 

connection points are: windshield wiper motor, blower motor or an accessory terminal on the fuse panel. 
Make sure to use wire that is as heavy as the wire of the compressor. 

 

Attach the black wire to any of the Pressure Switch’s connections located on the air tank. 

  The remaining Pressure Switch connection should be attached to ground. Secure the end under any metal 

body or to the negative side of the vehicle’s battery. The ground connection should be rust and paint free. 
Your compressor is now set for use and will turn on automatically when air pressure in the air tank falls. When 
air pressure reaches maximum PSI, it will turn off. If the compressor fails to reach the maximum air pressure 
of the tank, which is the Pressure Switch's cut OFF pressure, check all air connections for leaks. While the 
compressor is pumping, use soapy water or any bubble solution to perform this check. In case the leak 
remains after tightening, re-apply thread sealant. 

 

CAUTION

: Never touch fittings, braided hose or the air compressor with bare hands either during or shortly 

after use. 

 
HORN (SOLENOID) 

USING NEW HORN BUTTON 

 

Connect one of the electric valve’s wires to the positive (+) terminal of the battery, alternator, etc. This circuit 
should be protected using a 10A fuse (not provided). 

 

Connect the second electric valve wire to one of the Horn Button’s connections. The remaining connection of 
the Horn Button must be connected to ground. 

 

 

 

USING VEHICLE’S HORN SWITCH 

 

First, determine the switch’s polarity. The horn of most vehicles sends a negative (-) signal which can be 
confirmed by connecting one of the probes from an ohm meter to the wire of the horn while connecting the 
other one to ground. The meter should be at zero. This proves that horn circuit is negative (-). In case the 
meter reads anything other than zero ohms, test for voltage between the wire of the horn and the ground. A 
12-volt reading would mean a positive (+) horn circuit. 

 

Once you know the horn circuit’s polarity, connect any of the solenoid wires to the horn wire. 

  If you have a negative horn circuit, connect the remaining solenoid wire to a constant 12-volt power source. 

  If you have a positive horn circuit, connect the remaining solenoid wire to ground. 

Summary of Contents for VXO8350B/4124B

Page 1: ...astic Hose 6 Feet 12mm Thread Sealant Tape 16 Feet 30A In line Fuse with Waterproof Holder Remote Mount Air Filter Horn Button Mounting Hardware SAFETY INSTRUCTIONS Do not attempt to disassemble repair or customize this product Avoid setting up any parts of this product where there is a risk of falling off or risk of coming in contact with water Avoid reaching out to touch or pick up any fallen or...

Page 2: ...NNING YOUR INSTALLATION Before beginning the installation determine each component s spot Confirm you have the proper length of airline and wire Power wire to compressor should be kept short To power up the air compressor make sure you use a 12 gauge wire or thicker HORN MOUNTING Identify a suitable area for mounting preferably an unobstructed sheet metal surface like the frame or body of the vehi...

Page 3: ...battery of your vehicle doesn t discharge keep the engine running while the compressor is being used BRAIDED HOSE INSTALLATION Connect the stainless steel braided hose of the compressor to the tank s inlet port IMPORTANT The tank s inlet port must be 1 4 N P T National Pipe Thread CHECK VALVE The check valve is an important part of the air compressor and has only one function to let air flow from ...

Page 4: ...se as to prevent condensation from entering into the gauge Dropping or disturbing the product can affect the product s accuracy For best results the air gauge should be installed perpendicular to the ground with the zero facing the bottom To tighten the pressure gauge into the air tank place a wrench over the square wrench flats to tum the gauge This is the proper way to avoid air leakage or damag...

Page 5: ...essor is pumping use soapy water or any bubble solution to perform this check In case the leak remains after tightening re apply thread sealant CAUTION Never touch fittings braided hose or the air compressor with bare hands either during or shortly after use HORN SOLENOID USING NEW HORN BUTTON Connect one of the electric valve s wires to the positive terminal of the battery alternator etc This cir...

Page 6: ...tank is pressurized Solution 3 Check the fuse if blown disconnect compressor from power and replace the fuse Solution 4 Examine electrical connection for damage or corrosion secure electrical connections Issue Excessive moisture in horn or safety valve Solution 1 Depressurize and drain the tank Solution 2 Relocate the compressor to a drier location Issue Continual cutting off of Thermal overload p...

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