Madgrinder pretty well explained what you need to do. I agree, get rid of the Amp gauge and change over to voltage. The exception to what MG stated I would recommend (per Mad Electric) is to wire the battery terminal from the alternator to a central distribution point, and also run the looped wire to this same point. This gives the voltage regulator the voltage level at this distribution lug instead of at the back of the alternator. If you read the info at Mad, you will understand why this is better. You should also run a heavy gauge wire from the distribution point to the battery and this is what will keep the battery charged and supply power to the system when the motor is not running.

Take a look at this diagram at the MAD site:

http://www.madelectrical.com/electri...esensing.shtml

The red wire is your 10 gauge wire coming from the alternator BAT terminal to the distribution lug. The blue wire is the looped wire that Madgrinder mentioned going back to the plug on the alternator. Connect it here instead of at the alternator BAT terminal. The remaining wire on the plug at the alternator goes to your ignition.

Hope this explains it. Going through this helps me understand better as well. One of my winter projects is to redo the electrical distribution in my car along the lines outline in the articles.

Pat