Quote:
Originally Posted by xke190sl
The horn on my 88 560SL makes a dull "bull-frog" sound;it doesn't have that crisp clean sound. I have: 1. Replaced both horns; 2. Cleaned all the two wire contacts on each horn and ran 2 new grounds on the chassis (from each horn) with NO improvement. I am wondering if their is a horn relay? ANY ideas appreciated!
Richard 
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I know what you mean! One of the first things I did when I got my 300SL was to fit a couple of Fiamme air horns just inside the front grill. No additional relays fitted - I just paralleled the Fiamme air pump across the existing horn wiring.
It has the added benefit that if you just "blip" the horn, only the original "frog" horns operate, but if you really want to let someone know that you're there and keep it on a second longer the pump pulls in and you get a great sound
Even in the over regulated UK I've had no problems with car tests etc. as it's just one "blaaarreee!" rather than the (illegal in the UK) dee -dah - dee - dah type
cheers
Jim