You can get a wire or small cable through a grommit on drivers side firewall pic 1.
You can tap into 12 volt(you will need a fuse on + wire) and ground at battery you must match nut 10mm and double nut it because battery nut acts as tightining bolt and will not exept a eye loop.pic 2.(You can also tap in to 12 volt in the underhood fuse panel on drivers side)
If the horn needs more than 10 amps you need to install a relay . I mounted mine on top of grill/radiator suport in existing hole on drivers side pic3
There are more pics in the tech h3 section the under installing 12 volt airhorn
pic 1
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H3 gray adventure,brushguard,hood handles,sunroof,steps,crossbows,smokers package,window/sunroof visor,Airbrushed spare tire cover,mudflaps,K&N filter,SS Hummer insert,Hummer rubber mats,cargo rubber mat + shade,12 volt airhorn,eclipse nav/dvd/rear camera/mini remote,autostart,12 volt fridge,high beam garage remote,underhood air compressor, taillight bezels ,clinometer ,trailer brake and hitch.
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