I am intending to install two Highway Blaster horns(1 low tone, 1 high tone). I have a 30 amp auto relay so that I don't take a chance of burning out my horn button. I have the wiring diagram below from Gagets Page, but I am a little unclear on one aspect.
I see where the positive wire from the horn button attaches to 86 and where I think the other horn ground wire attaches to 85.
First, am I right that I just attach the two existing horn wires to 85 & 86?
Second, does it matter which one is which? For example if I get the positive & negative mixed up, will it let all the smoke out of the relay. I know when the smoke is all gone, the relay won't work anymore!
Lastly, if it is important to get the correct wires on those two terminals, how do I know which one is which?
Thanks for any help you can give. Please keep replies pretty simple. I am a decent mechanical engineer, but a little shaky on electronics.