Air Horns!
Decided to add some horns to warn innocent motorists that the beast is bearing down on 'em. Already have a Viair compressor on board- bought a couple used truck horns on ebay, total of about $80 in new and used parts- valve, hose, fittings, etc. Fabricated a bracket to mount 'em. I have a flip front clip on the ambulance and they clear firewall and radiator by less than an inch front and rear when it opens. What a noise!
O.T.- one of the horns stopped working after I got the whole thing in the first time- was hesitant to open the old diaphram up to see what was wrong- pretty simple in there-a copper disc held in place by a rusted out spring, with no seals. Apparently the air forces the edges of the disc to vibrate at frequency against the force of the spring, producing the noise. Made a new spring by wrapping bailing wire around a tapered dowel. Works great now.
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