2010 Fit Base - 2010 Accord horn - don't make no noise!
 

I unplugged my horn, unscrewed the bolt, plugged in the brand new, from the dealer 2010 Accord horn, put the bolt back in.

No horn.

What'd I do wrong??

which horn did you use? the one in the middle or the one under the driver side headlamp?

The one the guy handed over the counter from the parts department at Honda (brand new, still in the bag).

But guess what? Now the thing works. Go figure. That's the kind of week I've had. Maybe it just needed to get used to its new surroundings....

Might be there wasn't a good ground thru the mounting bracket at first. Once some current did flow it could have burnt a better path so now it works consistently. If trouble persists I'd unbolt, scrape the metal bracket to bare metal under the bolt, and retighten.

Paul H (ex phone man, dealt w/lots of "insufficient ground" troubles over the years.)

Same problem with mine will try again tomorrow.