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Wire colors of reproduction left and right hand switches

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alexdecker:

--- Quote from: Oddjob on June 14, 2023, 06:45:33 PM ---Horn depends on which wiring system it's using. One has the horn button being the earth and the other has the horn being the earth. Check your horn, does it have a small wire which goes to earth, round by the coils or sometimes on the horn bracket itself. The black wire is the power for the horn and some other things, without that connected not much will work. I presume the new switch has horn/pass or just horn?

Brown/white always seem to be for illumination lights but on the US model it's also used to power the running lights inside the indicators, that's the light blue/white and the orange/white.

Brown/blue was the buzzer.

--- End quote ---

The new switch just has a horn button. And my horn has two wires. A green to ground and a black to power. And they used to work, but with the new switch, all of a sudden it doesn't work, so just wondered about that. I thought maybe the black wire from turn signal switch to power had something to do with it.

mickwinf:
ok, the horn operation works in two ways depending on if you have the pass button or just horn. if just horn, the power goes from the black wire near to coil, to one terminal of horn, the other terminal is the light green wire to the handlebar switch then to earth through the handlebar when button is pressed. With the pass switch system the power goes to the switch via wiring loom black wire, then through switch when button is depressed via the light green wire to horn then to earth via a short wire from other terminal to horn mount. the black wire near coils is left empty in this application so if you connect to horn it does not work at all. will also depend if new switch is wired as original honda ones

Oddjob:
Mick has described it really well. On yours it sounds like the horn button is the earth. So the horn is getting power from the black wire near the coils, and when you press the horn button it earths out to the bars. If the switch isn't mounted on the bars there is no earth, have you been testing it with it off the bars? 

alexdecker:

--- Quote from: Oddjob on June 15, 2023, 12:25:26 AM ---Mick has described it really well. On yours it sounds like the horn button is the earth. So the horn is getting power from the black wire near the coils, and when you press the horn button it earths out to the bars. If the switch isn't mounted on the bars there is no earth, have you been testing it with it off the bars?

--- End quote ---

I have only tested it mounted to the bars. I haven't removed the actual horn from the bike, so that still has black to near coils, and green to earth. Ok, will need to figure out how to put this together, so it will function.

McCabe-Thiele (Ted):
Not sure if this will help but I had a similar issue on my 400 as the horn side bar switch does not have the Pass switch so the horn wiring is different - I found the original wiring diagrams for the two versions to know what colours I was looking for. IIRC the horn has two possible ways of operating.

First way is that one horn wire goes directly to earth the second wire goes into the loom connection,  the bar button in this case switches the live supply to work the horn via the loom. Only from memory but live bullet connections are originally only female and are insulated.

Second way is that live power comes out of the loom into the horn - second horn wire goes into the loom at the bar end this wire is again female as it is live - other side of the horn button is the earth.

I used a test lamp as am not very good at continuity testing - hope this helps in some way.

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