Got a bit of a problem with my horn. Basically the power comes from the battery, passes through the horn and is earthed through the switch. Now, since my horn bracket is made of metal and is attached to the chassis with a metal self tapper, it earths the horn through the chassis, bypassing the switch and sounding the horn whenever I connect the battery!

I'm sure people must have come across this problem before, any suggestions on the best way to isolate the horn bracket from the chassis?

Thanks

Pete

Try running the power through the switch, the way it's set up not you have constant power, assuming the chassis is running negative current.

yup, switch the live rather than the earth - where did you find an earth on it anyway?! most earth thru the chassis! I used a relay on mine too, cos the current drain can be significant.

i've got a switch on the live as well, but no relay, took it from a mk4 escort and put it in as it was.

Best to wire in a relay and wire the switching current only through the horn button as below.
Rescued attachment horn.jpg

as is being said / inferred, most horn pushes cant take the horn load, so you need the relay - which solves your wirign probs too

atb
steve

Thanks, looks like the relay idea could be the best one.

I personally would have run the live through the switch as suggested but this is the way the loom came when I bought it and I can't really change it now, so looks like I'll have to use the relay idea instead


Pete

there are actually two types of horn
first has only one connector for live feed and earths through body
second has two connectors, live feed and earth. looks like you are trying to mix the two