I'd slow charge the batt overnight & see if the needle is slightly to the right like it was way back. If not I'd take off both field wires from the alt and the connector from the reg & with jumper wires with alligator clips on both ends jump 12V from the batt positive post to one of the alt male field terminals and to the reg "top blue wire" male terminal and jump from the other reg "side" male terminal to the other alt male field terminal & jump from the reg case to the batt neg post & see if you're good at a fast idle. If so that tells you the hard components (alt/reg/batt) are good & the problem is in the wiring/grounds. The Madd upgrade has it's good points but if the overcharging ain't dealt with 1st the overcharging will fry something in the system & you'll see 15-16 volts on a voltmeter as opposed to the ammeter pegging. What Nanket said, clean the connections especially the bulkhead & reg ground after you've verified the batt is topped off & see where you're at