Miata Mailing List: July 1994, Message #9
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   From: "Robert Cohen" 
Subject: Re: Air Horns Again?
   Date: Fri, 1 Jul 1994 11:06:31 -0400

        Reply to:   RE>Air Horns Again?
Edward Hoffman writes:

>When I pressed the horn my dash lights and headlights dimmed. Not
>a lot, but it doesn't seem right to me. I looked at the directions (When all
>else fails ...). They are very non-specific to the Miata. They call for a 30
>amp in line fuse, whereas the Miata has a 15 amp fuse on the horn >circuit. I
don't know if this is the problem or not.

>....What amperage fuse do the Automations call for? 

My set of Automation horns did not mention the fuse. It essentially
was a "dismount stock horn, then install new one" type operation.
It was pretty easy, actually.  (Although the comments about a 
better mounting bracket are accurate.  Someday, I'll get a stiffer
piece of perforated steel at the hardware store, and then I'll be
happy).  They seem to work fine with the 15 amp fuse, and I don't see
any of the dimming problems you mentioned.  You might want to
check and see if the ground connections are nice and tight, just to
make sure a marginal connection isn't resulting in a point of 
high resistance somewhere.  (hey, that sounds good to me, but I'm not
a EE, so what do I know).

>Are the Automation horns the same?

My Automation set came with 2 black trumpets, with "made in Italy"
engraved on the back (metal portion).