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Sorry, I don't yet know the routing question. I was originally going to run cable to the back along the door sills and had the same question...where to go through firewall to get from batter to the door sills. I've been too lazy to explore this yet.

Besides, I've decide to take a different approach and run cable along the frame rails to a battery mounted up in the back and come in off the rear mounted battery over the wheel wells. This is a project that I'm planning on before Christmas once I get some other crap off my plate.

I'm installing lights in the next week or so and plan to drill through the edge of "the grommet" to do my switches. If I see a good answer to this question, I'll let you know.

Charles, and many others, probably know where to poke through. I believe he ran the sills. I just don't know where he went through the firewall.