Horn not working! I know this has arisen before, but I am trying to locate where the yellow & Black earth wire is earthed to the body when it leaves the horn ring on the steering wheel & boss, I have checked the button, it works fine, I have checked the live on the horn, that's fine, but the yellow/black lead in the wheel boss does not seem to go to earth When it leaves the boss via the copper contact ring then through the bulkhead, is there or should there be an earth connector to the body, if so where is it? I have put a meter on the copper boss ring to earth & there's no connection to earth.
. Also I would like to connect another horn in addition to the one there
( when it's working) should I use a Relay?:


. Also I would like to connect another horn in addition to the one there
( when it's working) should I use a Relay?: