SOHC.co.uk Forums > CB350/400

Horn wiring...

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Lobo:
Bad luck Lynx..

To check your wiring simply put a 12v bulb between your horn feed wire & earth. It should light when you press the horn button... (Ignition on!)

These horns can be very voltage critical... depending on the adjustment screw. If not set up & voltage just slightly low all you might get is a 'click'.... often not noticed as mostly horns used with the engine running... ie with circuit voltage up around 14V ... instead of (eg) 11.5 with a tired battery. What I'm suggesting here is your test battery possibly a bit low?

Regardless, on your 'next' horn try loosening the adjustment bolt at its rear, and using a screw driver adjust to the point you get a good loud beep at all voltages.

Bryanj:
The change from button earthing to button supplying power wasn't by market but by year of manufacture, trouble is people think of year of registration as manufacture when the crate could have sat for years between manufacture and sale

Lobo:
Ah! That's interesting Bryan... explains things; I thought it was dependant upon market destination. Makes life a litte more complicated renovating due DSS replacement wiring looms etc may well be different spec to your handlebar switch set-up: speaking from experience with my K2.

Lynx:
BTW my horn works now. Tested direct to the battery just as before but this time makes a sound. Then fitted to bike and it still works  :). I guess the guy at Classic bike spares tweeked the adjusting screw before sending it back.
Thanks for all the useful info.

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