Lucus 8H Horn advice please

[Billybream]

 Just rewiring my 1960 Super Rocket after complete renovation, horn will not work, tried small adjustments by both screws but no action, construction is crimped, can I strip to investigate further, any tips please. Mine is 12 v version horn running on 6 v system, with date stamp of 466, so prehaps not the original.

[BSA_54A10]

You will not have much luck getting a 12 V horn to work in a 6 V harness.
It will draw near 20 amps which your system will have difficulty supplying and at best will make an anemic croak.
To add to that the extra current draw will burn the contacts in the switch & horn.
If you want it to "look right" leave it there & cut off the wires just inside the loom.
Fit a modern 6 V horn ( japanese trailie ) under the tank or behind the tool box where it can not be seen

[trevinoz]

I don't think that a 12V horn will draw 20 amps as it has twice the resistance of a 6 unit.
However, you won't get much noise out of it if you get it working.
Mostly horns stop working after lying idle for some time because the points get a film of corrosion or oxidation which effectively raises the resistance or insulates the points.
The only cure is to clean the points and readjust the horn.
I have never dismantled an 8H, yet, but I think they are riveted together. I will check later.
Your 1960 bike probably should have an HF1441 horn, like Triumph and some AMC bikes had.
The 8H was fitted at some time but it is unclear when.
Best you find a 6V unit or do as Trevor suggests.

Trev.

[Billybream]

Thanks for the advice, going to hide low cost replacement unit. Wiring now complete, all works ok, just await tank and guards from painter to complete my restoration.

[BSA_54A10]

I don't think that a 12V horn will draw 20 amps as it has twice the resistance of a 6 unit.

Err year OK got that one a bit backwards.

[duTch]

Heya Billybream, And all, Here's a link to the guy in South Aus.,
 http://www.classicandvintagebulbs.com/

I had a look the other day for halogen bulbs and saw he does a 6v 100mm horn chrome grille all the stuff looks ok- $ 35au. I'm looking at doing one, it could be what you need.
 If I can post a pic I will but not looking promising. Can (maybe) post the whole catalogue if you want he said that's ok(why wouldn't he,saves him the hassle)
     Cheers fer now duTch
 PS.
when I was about 14, ratted a really old(then) Delco Remy 6v horn from the local tip,think from my mates dads truck- THAT is a HOOTA!! Had on the side of my beeza in the 80's for a bit but too big