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VXO8705/4124C 

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 VXO8705/4124C

Page 1: ...ing 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 water submerged parts Never leave this product unattended during use Intended for use by adults only During and immediately after use avoid touching any part of the compressor with bare hands as it is very hot during such periods Avoid s...

Page 2: ...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 vehicle so as to provide a firm platform which will help protect the horn from damage due to shaking Never attach the horn to any plastic or other flexible material Mark the spots for the holes with the b...

Page 3: ... 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 one side to the other in this case from the co...

Page 4: ...hread sealant provided install the air pressure gauge The side or top of the tank is the best location to use 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 ...

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: ...n is inaudible Solution 1 Check all switches to make sure they are ON Solution 2 Assure air 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 Solution 1 Depressurize and drain the tank Solution 2 Relocate the comp...

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