The ones that mount on the firewall need two terminals since the wooden firewalls don't offer a ground. I don't know what year they started mounting MAG horns to the engine but that horn must be intended to mount to the engine. I am guessing 1922 or later.
That horn will work on a 1917 of course, you just need to add a ground wire someplace.
Quote:
Originally Posted by 41panelmark
Royce, I have a battery horn that mounts like that and today I picked up a Mag horn that looks like the 2nd photo. That horn has Ford script on it and only one terminal. If not for 17/18 what year do you think it was for?
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