Hi all,
Not a big issue and still working on it but have just installed air horns [ eBay cheapies but heaps better than standard ] to work via the factory horn button and not sure if it's my wiring or the cheap relay but when I hooked up the factory cable to the relay for the air horns it operated fine 3 times then blew the 7.5 amp fuse under the bonnet no spares the right size so temporarily used a 15 amp fuse & now works fine but the relay is heating up and staying hot while the wiring is connected. Is there maybe a residual current in the factory wire? Now thinking try new Hella re