Yes normally with a gate or between two terminals that aren't common? This normally makes another terminal
live when the coil is energised, this one doesn't??
I have not checked the Ohmic resistance between the terminals, it's ringing through a continuity tester..
This is not going to be my main horn, just a bit of fun at shows through a separate switch.
Both of these contacts are common to the earth too??
Cables supplied with the horn are still attached...The black cable on the right goes to the bottom right terminal, that terminal is common the one that is stamped PUL, which is linked via the small brown linkage to the BATT terminal??
I managed to get this off the internet but I do not think this is right??
I did manage to find this on-line but unfortunately, the original document (you can see on picture no.5 top to bottom) you cannot enlarge but you can kind of make out what it is...
Vintage Maserati/Harry Moss Air Horn SOLD (1960) on Car And Classic UK [C462960] - http://www.carandclassic.co.uk/car/C462960
Anyways, someone might say this is easy, I have it running and clicking through the relay but I don't like the splashing, it's almost as if there's a dead short..
The compressor weirdly will run either way by putting 12v across the terminals, it makes no difference across the terminals which way around this is, meaning whether the comp is sucking or blowing, it blows both ways!!
My other thought is negative earth switching??
Thanks to all again and hopefully some of the above will help..
Gary