12 volt to 6 volt horns

[Erich]

Hi All,

In converting my Ulster Rep from 12 volt to 6 volt, I just realized my horns(I have a Rist as well as a Klaxette) are intended for 12 volt. Will they work on 6 volt or will I need to flog them and find a proper 6 volt horn?

Erich in Mukilteo

[Robert Leigh]

I think it likely that using a 12 volt horn on 6volts will give poor sound if any. You are better off going the other way where the right resistor might give satisfactory performance.

[Tony Griffiths]

I tried a unit similar to this - a 6-volt to 12-volt  transformer with a limit of 3 amps - on a set of indicators and they worked perfectly.  https://www.aliexpress.com/item/10050021...QFEALw_wcB

Others might work include: https://www.ebay.co.uk/itm/405366474034?...0dEALw_wcB

and: https://www.ebay.co.uk/itm/334366744658?...iMEALw_wcB

[John Cornforth]

Hi

Horns tend to take quite a lot of current, so any electronic converter needs to be man enough for the job

[Graham Barker]

Hi Erich,
I have a 12 volt horn similar to the Altette horns fitted to the Rubies. This works well enough on 6 volts to satisfy local (WOF/MOT) inspectors. It was not reliable for a while until I discovered that one cell in my 6 volt battery was faulty. With a new battery it's fine. This indicates that these horns have a high current draw, reinforcing John Cornforth's comment.
Regards
Graham