Alfa GT horn upgrade - Alfa Romeo Forum
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Alfa GT horn upgrade

With the bumper off for other repairs and maintenance, have decided to upgrade the two horns to a single unit twin tone air horn.
Removal of the horns and their mounting bracket leaves me with 2 sets of purple & black wires. Connecting a volt meter across each set and pressing the horn on steering wheel, gives readings fluctuating between 4 and 10 Volt.
With the air horn only having two terminals ( + & -), do I bridge the two purple wires and connect to + on air horn and two black wires to - on air horn ? Or do I use only one set and blank the other one off ?
Would really appreciate input from someone that has done a "horn conversion"
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Hi there.
I have just put my Unus twin tone air horns from my old 1980 Lancia Beta HPE onto my GT.
I got some piggy back connectors and some male and female connectors plus some wire from Maplins and connected the same coloured wires together as you said and connected up to the terminals on the air horn and bingo.
A real Italian blast from the past.
The horn just sounds so right now.
Hope your mod goes well.
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