Cam3roon2k41999 said:
Hi, thanks for the reply , sorry I only just got you're message
I'm waiting on a new horn and switch as my horn produced allot of smoke due to me being a idiot connecting a 12v horn to 72v isn't a good idea
I've connected a 12v 10a DC-DC converter to my ignition wire that is for 72v my lights etc are made for 36-72v I think so I have them directly connected to my ignition power and works fine up to now, I've ordered a 12v motorcycle high tone horn should I comnect that to the DC converter that's connected to my ignition? Thanks
Depending on the horn, you may need a lot bigger DC-DC; many horns take 30A or more at startup, and will just shutdown a smaller converter (or blow it's fuse if it has one). You'll have to test it and find out.
If you have a 12v car battery you can hook the horn up to, and a clamping-style current meter, you can set it to it's highest range and test the current the horn actually takes, best if it also has a peak-hold for the highest reading it detects.
Otherwise you'll just have to see if it works on the DC-DC you already have, while it is also running all the lights/etc.
For that, if you have a horn button on a control on your handlebars, you have to see how it is wired first (is it two separate wires, or does it have one horn wire and one that goes to 12v or one that goes to ground, etc), and then I can help you determine wiring for the horn.
If you use a separate horn button that's just two wires, just put it in series with the horn and one DC-DC output wire (either ground or positive, doesn't matter), then hook the other horn wire to the other DC-DC output wire.
Also note that "12v" is pretty low voltage for automotive / mc 12v accessories; they actually run on 13.6-15v, so lights will usually be noticeably dimmer and horns quieter on 12v.