I did disconnect my battery when doing the install. I actually removed the entire battery tray to get good access to the firewall pass-through on the passenger side. It's directly below the battery tray.
I also permanently removed the little plate on the underside of the seat that those cables are anchored to because of a fitment issue.
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This is the connector for the fan speed. I just pulled the pin out (orange and pink wire) and soldered the ARB switch dimming wire to it, and re-inserted the pin in the connector. I hate tying into wires with butt splices etc.
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I did the same thing for the wire for the 12v tie in for the ARB switch. You can pick up the blue/pink wire out of the cigarette lighter.
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