So, I've got something thats draining my battery. When I initially hook my battery up, there's always a spark to my negative cable, and if i leave the battery in for more than 24 hours, my battery is drained to the point that it doesn't have enough juice to start the bronco. I know that a faulty alternator is a common source of battery drain, so is there any way I can check this? Is there anything else I should check before I commit to a new alternator? My engine bay is pretty much stock and I've basically replaced the whole starting system (solenoid, starter, wires, battery, ignition switch). Thanks in advance.