okay ive purchased some airhorns for my car, the instuctions suggest i i earth the compressor and run a live into the car to a switch via a relay
id rather wire them like this if its safe..fused power wire from batt to compressor, then run a earth wire into the car to a switch rated at 20A which is what the specs say
anyone see a problem doing it this way with proper amperage wire,fuse and switch?? as far as i can tell its how my original horn is wired
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Can't you use the wiring from the existing horn to switch a relay near the new horn which will then switch the horn to save running new wires into the interior?
Many horns are permanently +ve with a switched -ve earth, so be aware yours could be like this.
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id like to keep my orig horn and have an aditional button or the others
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I would stick to relay method...Safer
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Steve
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steveo....any reason why mt idea is so bad?? as far as i can see my orig horn is wired in that way
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Your standard horn takes a relatively small amount of current. The startup current on a compressor is quite high. In the past I found that you need really thick wire if you want to run the wire into the cabin and back out again otherwise theer is a noticable delay before loud noises come out.
Wire it with short wires and use a relay driven from your existing horn. If you just want a quiet 'parp' then by just tapping the horn button your standard horn will sound, but not the loud ones as it takes time for the compressor to spin up.
Martin
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