Jim,
My guess is that it is getting slightly less than 12V.
I would try adjusting the horn, there is a screw on the side.
Don't go very far and take note of where it was set to initially in case you
have
to go back if adjustment doesn't work. But also, try cleaning all contacts and
look for corroded grounds.
Gary
-------------- Original message --------------
From: "James Pickard" <geowiz.sgy@cox.net>
> This one has me stumped. My HIGH horn doesn't work. It works fine on a
> bench test when hooked up directly to a 12-volt car battery. But it doesn't
> work in the car. The LOW horn works fine. I've tried swapping sides, but
> it makes no difference - the LOW horn works on both sides, while the HIGH
> horn never works in the car. The HIGH horn just goes THUNK. Suggestions?
>
> Jim Pickard
> B9473298
> Lafayette, LA
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