I'm a newbie so please have mercy. I have read all the past threads about alternator problems (15 pages I think) and I have checked all the information that was given. The volt meter shows the needle in the red just over the line that separates green and red. I will give you what I have found and hopefully someone has an answer. Truck not running and batteries disconnected: Battery 1 12.6 volts, Battery 2 12.8 volts. Truck not running but cables hooked up: Battery 1 12.6 volts, Battery 2 12.8 volts. In series we have 25.4 volts. Truck still not running: back of Alt. 1 12.6 volts, back of Alt. 2 12.6 volts at the post which is like in the 9 o'clock position, back of Alt. 2 at the post which is like at the 12 o'clock position 25.4 volts. Now will check the white plug with engine still not running, plug is plugged in. Alt 1 red wire 12.6 volts, exciter wire 0 volts. Alt. 2 red wire 25.4 volts, exciter wire 12.6 volts. Now the truck is running, Alt. 1 red wire 15.1 volts, Alt. 2 red wire 9 o'clock position 15.2 volts, Alt 2 red wire 12 o'clock position 30.8 volts. When you get ready to start truck, turn key on and wait for wait light to go out. Light goes out, start truck both generator lights go out and voltmeter goes to green with needle pointing to top tick mark in green scale. After a minute the needle then goes out of green into the red just separating both colors but in the red. I do here a clicking noise from under the dash on the lower left just before the voltmeter fluctuates and then goes to red. Could both regulator's be bad and overcharging? If that is the problem where would be the best place to get new rebuild kits. Thanks.