Bought new battery after last new battery died after 2 weeks of being connected only drove a little bit each week, new battery won't charge at all on old alternator so I bought a new and it had 3 terminals when the plug has 2. Either I rebuild the old one, see if it works or ʞ©$ɟ around with the new one. Can the voltage regulator if faulty, stop the alternator from charging? A lot of questions I know! I'm new to this please help