Does the wolo use a compressor? Does it charge up to blow the horn or does the compressor just come on to blow the horn? I would guess the latter but if not, then the humming MIGHT be the compressor coming on.

There is a possibility you blew the stock fuse. Unplug the wolo and the left horn should work fine. If it doesn't work, then check for a horn fuse and see if it's blown.

You might have to do your own wiring for the Wolo. Use the existing horn wiring as your switch for the relay and wire the Wolo power directly to the battery.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI
All mod descriptions and pictures © 2007,2008 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.