Too much voltage??

[10w30dna]

Just remember that the charging system works on the inverse. Low system voltage results in higher charge rate and opposite happens w/ higher voltage ( fully charged) results in lower output.

[My427stang]

Todd,
Have you heard of Mark Hamilton of MAD electrical?  Here's a link from his website: http://www.madelectrical.com/electricaltech/howitworks.shtml. In this article he says a 12 volt system needs alternator output of around 14.2 volts.  Btw this is a really good source for auto electrical knowledge and components. I first became aware of him when I installed the MSD ignition and mounted the control box under the front seat in my Fairlane.  He has written several articles on how to do proper wiring, repairs, and how to improve the electrical systems on our cars. Hope you enjoy.

 Voltage should be 13.8 Min to 14.8 max for a properly working Alt. Also put a load on the system. Turn on your head lights and heater. It should drop and then pick back up. Long as your in the range... Your good! JMHO

X2

[fe66comet]

One way I test also is to remove the bat wire off the alternator and put an ammeter in line if the car does not have one already.