Re: Need a switched power source to tap...
I used the acc outlet for 12 volts (or get it under the dash in trailer wires or under the hood).
I taped into the green/white ignition wire behind the wheel(comes down from the key)to switch it on only when trucks running.(to power fridge).
I first hooked it up to key foward and back(acc) but I had batterey issues.
I used the yellow wire that goes to rear wiper(to relay)
What are you installing ? 
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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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