Air Horn Pull Chain

I have to install a set of train horns in a customers vehicle with a pull chain and i dont want to install an air valve in the head liner. Can i accomplish this with a few relays? Basically what it needs to do is when you pull the pin switch it removes the ground and opens the relay.

If this is supposed to be for a set of air horns with onboard compressor, how are you actuating the air valve? Is there an electrically operated air valve somewhere in this setup? How are we getting from electrical relay contacts to opening an air valve?

Good Point dualsportJohn DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

it has an electronic air value

So it seems you just need to find a pull chain switch and connect it to the chain, since your electronic air valve isn't likely to need much drive current. Relays should only be needed if your switch is the wrong type (like NC vs NO) and you need to invert it or if your mechanical switch is too puny and can't handle the current needed for whatever device you're driving. I guess there's no horn button on the steering wheel, or a pull chain is needed to simulate the full trucker experience?