Tom Hartley Posted January 19, 2019 Report Share Posted January 19, 2019 I have fitted an aftermarket hazard light switch to my Herald which wires to the indicator feeds, 12v and 0v and interrupts the feed to the normal indicator flasher unit when pulled. When I pull it on the horn sounds! I'm nowhere near the purple earthing wires in the steering column or the permanent feed wires to the horns. WoThFk is going on? Can anyone explain what might be happening? Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 19, 2019 Report Share Posted January 19, 2019 Yes. your horn is working Thats really useful Can you discconnect zones of the horn harness to cease the horn and maybe locate where the cross feed is coming in ?? Pete Link to comment Share on other sites More sharing options...
JohnD Posted January 19, 2019 Report Share Posted January 19, 2019 Do you have a theft alarm fitted, Tom? Those routinely sound the horn and flash the flashers. John Link to comment Share on other sites More sharing options...
Tom Hartley Posted January 19, 2019 Author Report Share Posted January 19, 2019 Nothing as fancy as an alarm, just a crooklock. The wiring _may_ have been played with when it was resprayed but I doubt it. Everything works as it should, and it's a simple loom in a Herald and without much modification so I can't imagine why it's sounding the horn. I know you can get lights flashing other ones because of a bad earth. Could it be something like that? Link to comment Share on other sites More sharing options...
Colin Lindsay Posted January 19, 2019 Report Share Posted January 19, 2019 Does the horn sound continuously, or intermittently as the lights flash? You'd expect it to be intermittent if the switch circuit was causing a poor earth, as it would be interrupted regularly as the hazard system switches on and off. If it's constant then it's earthing regardless of the switch internals. I'd string an additional earth cable from the switch to a handy earthing point, even just temporarily, to see if that stops the horn sounding. Link to comment Share on other sites More sharing options...
JohnD Posted January 19, 2019 Report Share Posted January 19, 2019 The wiring of the horn on Triumphs is a bit weird, to me. Rather than a liove feed, switched by the horn button, there a live feed to the horns, which the horn button earths to sound them. Where does the hazard switch earth go? J. Link to comment Share on other sites More sharing options...
NonMember Posted January 19, 2019 Report Share Posted January 19, 2019 That sounds decidedly weird, Tom. If you want a second pair of eyes on it you'd be welcome to pop up to my garage tomorrow afternoon. Link to comment Share on other sites More sharing options...
PeaTear Posted January 19, 2019 Report Share Posted January 19, 2019 4 hours ago, Pete Lewis said: Yes. your horn is working Thats really useful Sorry I don't have anything constructive to add to your issue but Pete's reply made me giggle Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 19, 2019 Report Share Posted January 19, 2019 There was a song about a bubble car going beep beep and was stuck in 2nd gear Rob you should hear Tom coming down the road Pete Link to comment Share on other sites More sharing options...
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