I am wanting to attach a cable to the battery of my 2019 Mirage, and go through the firewall to a connector in order to attach a solar-powered battery-maintainer. I've been snaking the cable out from under the hood, and attaching the solar panel to the roof using suction cups, but that is a really clunky solution! Much better, I think, to have the whole system (except for the part under the hood) enclosed in the passenger compartment, and attach the solar panel on the inside of a window. Can I somehow stick the cable with the many other cables that already go through the firewall? I'm afraid if I try that, I'm likely to damage the other wires and/or the electrical system!
When I went to the dealer to replace the original battery and inquired about my idea, they said, "Advised customer in regards to aftermarket (meaning not made by Mitsubishi) solar charger, that wire would need to be cut and rerouted through fender. Cannot perform work here due to aftermarket component." To me that makes no sense! The fender?!?!
Anyway, is it safe to drill in any of the places I've marked with red arrows? If so, which one(s)? One photo shows under the hood, and the other shows under the steering wheel are.