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PA button

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Trigger:
Cheers Oddjob and Bryan, Got another switch which seems to match. From the PA we have 1 Black, 1 Dark blue and a Light  green. From the indicator switch 1 Orange, 1 Light blue and a Gray. From the High low switch 1 White, 1 Black/yellow. Now, everything matches up to the loom but, the horn button which is the Light green doesn't work. Run a meter from the Light green to Black and have a reading when the button is pressed. Run a direct live and ground to the horn and it works.
Took the switch completely apart found no problems (nice and clean) cleaned it up to be on the safe side. Looked at a wiring diagram and it states that the horn switch is Light green and ground. Can get a reading across light green to ground and have a reading across light green and black, when the horn button is pressed.
Any ideas????

mickwinf:
Trig I have come across this problem before and have helped a couple of members before. The wiring diagrams in Haynes manuals are for the older type switch and don't apply to the  K3  or later f. The black wire supplies a + supply to the little plastic box at horn/pa switch, then the blue wire takes current to main beam when PA is pushed to the right, when button is pushed straight in the current goes via the light green wire to one of the terminals of the horn, then you need a short wire from the other terminal to earth on the horn mounting bolt. So it doesn't earth at the switch at all as the older type did, just to confuse the issue there is a spare black wire near the horn which should be left not connected to anything, I think its used on the US bikes as they don't use the PA system.

Trigger:
Mick, understanding you on the live feed Black, blue to head light and light green to horn. We found that out on the meter reading and when we stripped the switch. Not understanding your quote of "then you need a short wire from the other terminal to earth". What terminal are you on about Mick?
I did think it was down to the horn not being earthed to the frame, so i run another earth from the coils just to check but, it seemed to be the same.

Trigger:
Cheers Mick, i think i know what you are saying now. What has happened is the Light green has become live at the horn switch, so what i have is 2 live wires going to the horn. I will have to pull the bullet on the black at horn and connect to earth. Or am i wrong???

mickwinf:
yes you are correct, in effect as it is now you have 2 positive feeds to the horn, one constant one via the black wire and another via the light green wire when the horn button is pressed. Remove the black wire from the horn and make a short wire to go from the terminal to earth, a mickwinf guarantee it will work!

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