horn not working, when the horn is depressed it sounds for a brief few seconds but then blows fuse in interia fuse box, also interia lights and dash display goes dim while you are pressing horn. i have disconnected horn but still the same, found relay in relay box under the windscreen which energises when horn is depressed, i have bridged other 2 pins at relay, but horn does not sound. anyone come across this before. thanks
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