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I would come out of the fuse box, even if it means going inside the cab to get to it. But I think a lot of the newer trucks have a fuse box in the engine compartment too.
I just did that it works. I found a grommet that I was able to go though, and finally found some mini fuse tap in clips at a local auto store, but couldn't find the very small spade teminals so I solderd the wire to the clip.