ALLREY 12V Air Horn Kit, Super Loud 18 Inches Single Trumpet Truck Horn, Train Horn with Compressor for Any 12V Vehicles Silvery Black

Item Dimensions:LxWxH 17.5 x 4.33 x 3.94 inchesColor: SilveryMaterial: zinc aluminum alloySurface technology: chrome platingVoltage：12 Volts

Dimensions: 4-1/3inch height x 2 inch diameter.ilvercolor on the surface，vacuum chrome ; stable performanceNew Upgraded Compressor: Red copper coil.

Annex: air pipe (inner diameter: Φ7mm, outer diameter: Φ10mm, length 550mm)1 triangular iron5 screws

80A Relay, 30A Fuse, Red wire 150cm, Black wire 20cm, Yellow wire, 20cm, Blue wire 15cm, White wire 15cmAll copper parts riveted

Equipped with a 3-meter long cable harness button, it does not affect the independent installation of the original vehicle line. Paste it anywhere. Easy to operate

Several common wiring errors:1. After connecting the line, press the horn button, the horn will not sound, and the relay will not clatter, which means that the blue line and the white line are wrongly connected. They should be connected to the power supply of the original car respectively. They can connect the horn line of the original car or the battery.

2. The air pump makes a whine sound but the horn doesn't sound, which means that the positive and negative terminals under the air pump are connected reversely. The yellow wire should be inserted into the positive pole and the black wire into the negative pole.

3. The sound of the horn is not stable, and sometimes it will break. That's because there is paint on the frame where the black wire is grounded, which affects the normal power on of the negative pole. As long as it is connected to a good power on position, it is OK.