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Or,,, since you are installing it under the driver's seat,,, you could just tap into the 12V supply that is most likely already run underneath your console/center seat for the 12V outlet. I can't quite remember if this outlet is switched or not??? I'm thinking it is,, but I can't remember for certain.
Toyota did the hard work,,, just take advantage of it,,, you'll even already be fuse protected and you'll only have to run about 16" of wire.
Just a thought,,, but I don't know how your truck is equipped,,, so I may be way off.
