My head unit got stolen, they ripped it out. I bought a wire harness, but bc they ripped out the deck, the factory harness went with it. Can I just solder the wires directly to the wires provided with head unit and not use a wire harness? also, all the wires are present on my car except the battery. Can I just hook it up directly to the battery? and also, is the power wire and ignition wire mean the same thing? if not. Im missing the power and the battery wire