When the battery is low many things don't work right. Keep an eye on the voltage, and BTW you can shut off the interior lights while the door is open. Push the thumb wheel control all the way down, next to the headlight switch.
The kick panel is where your foot rests, behind the parking brake foot control. All of the wires for the LF door go into the body there from the outside. You can remove a couple of trim screws and get in there. But I would think that any break in the wire would be in the door jamb area itself, inside the rubber boot covering the wires. There is a long wire tie which holds that boot onto the huge connector, you likely would have to cut that tie off. The rubber slips back easily then to let you get to the wires.