finished repowering bobcat 530, removed entire original wire harness. Two wires coming from new engine, one to battery positive, second to where?? I've wired it to the keyswitch and runs great used for several hours. next day (new) battery was dead. I also set the multimeter Vdc and red lead to battery positive and black lead to negative while running at idle shows 13.3 Vdc. Thoughts? Seems simple to wire only two wires, but have not found a schematic to reference.