How should the compressors for the Vixen VXH2112C air horn kit be mounted?

In a dry area inside the engine compartment away from exhaust and engine manifold heat, secured through a 3/16" drilled hole, and mounted vertically with the air exhaust port on top, using the bolt in the housing slot with the provided lock washer and nut.

What size fuse does the VXH2112C wiring require?

A 20A fuse (not provided with the kit) to protect the electrical circuit.

How do you wire the included 4-pin relay for a new horn button?

Connect PIN 87 to the compressors' positive terminals with 16-gauge or heavier wire; PIN 85 to the horn button (other button terminal to clean grounded metal, 18-gauge or heavier); and PINs 30 and 86 to the battery/alternator 12-volt positive with 16-gauge or heavier wire through a 20A fuse.

Can this kit use the factory horn switch?

Yes. For two-terminal factory horns, transfer the wires to the compressor terminals (reverse them if the horn doesn't sound). For one-terminal horns, run the factory wire to the compressor positive terminal and ground the negative terminal with 16-gauge or heavier wire.

What wire gauge is needed for the compressor ground and power connections?

16-gauge or heavier for the compressor ground, relay PIN 87 feed, and the PIN 30/86 power feed; 18-gauge or heavier for the horn button circuit.

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Vixen Horns VXH2112C Dual Trumpet Air Horn Kit Installation Guide & Wiring

Vixen chrome dual air horn kit with mounting hardware, compressor and relay wiring instruction sheet

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Vixen dual trumpet air horn kit laid out with two air canisters, mounting brackets, hardware and an installation sheet showing the relay horn-button wiring (20A fuse, 16-gauge wire).

AI caption June 2022 · Photo 1113 of 1514

This photograph shows the contents of a Vixen Horns VXH2112C dual-trumpet air horn kit laid out on a workbench, along with page 2 of 2 of its printed installation guide. Visible kit components include two chrome trumpet horns on a mounting bracket, two chrome electric air compressors, clear air line tubing, a rubber mounting gasket/plate, a 4-pin automotive relay, and mounting studs with nuts. The legible portions of the installation guide cover: (1) Compressor mounting — install in a dry engine-compartment location away from exhaust/manifold heat, drill a 3/16" hole, and mount the compressor vertically with the air exhaust port on top; (2) Electrical connections using the factory horn switch — transfer factory horn wires to the compressor terminals (reverse polarity if it doesn't sound; single-terminal setups need a 16-gauge ground); (3) Electrical connections with a new horn button using the supplied 4-pin relay — PIN 87 to compressor positives (16-gauge+), PIN 85 to the horn button with the other button terminal grounded (18-gauge+), PINs 30 and 86 to 12-volt positive with a 20A fuse (not provided). A wiring diagram shows air lines, compressors, horn, 20A fuse, grounds, horn button, power source, and the 4-pin relay. Some middle text is obscured by parts lying on the sheet.

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Frequently asked questions

How should the compressors for the Vixen VXH2112C air horn kit be mounted?: In a dry area inside the engine compartment away from exhaust and engine manifold heat, secured through a 3/16" drilled hole, and mounted vertically with the air exhaust port on top, using the bolt in the housing slot with the provided lock washer and nut.
What size fuse does the VXH2112C wiring require?: A 20A fuse (not provided with the kit) to protect the electrical circuit.
How do you wire the included 4-pin relay for a new horn button?: Connect PIN 87 to the compressors' positive terminals with 16-gauge or heavier wire; PIN 85 to the horn button (other button terminal to clean grounded metal, 18-gauge or heavier); and PINs 30 and 86 to the battery/alternator 12-volt positive with 16-gauge or heavier wire through a 20A fuse.
Can this kit use the factory horn switch?: Yes. For two-terminal factory horns, transfer the wires to the compressor terminals (reverse them if the horn doesn't sound). For one-terminal horns, run the factory wire to the compressor positive terminal and ground the negative terminal with 16-gauge or heavier wire.
What wire gauge is needed for the compressor ground and power connections?: 16-gauge or heavier for the compressor ground, relay PIN 87 feed, and the PIN 30/86 power feed; 18-gauge or heavier for the horn button circuit.

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