Firedude38, a voltage of 12.4 on the battery with the car off means your battery is a little low.. charge on battery with car off should be 12.66 volts your idle voltage is ok as is your 2K RPM voltage (which should be between 13.5 and 15 volts ... charge your battery (preferably with a slow charger for a better charge) and let me know what values you geth then, but it looks lile you are ok -Chris DMC6453 .. running a D130 firedude38 <FireDude38@xxxxxxx> wrote: These are my volt reading off the alternator. engine off 12.40v at idle 12.95v 2000 rpm 13.65v Are these numbers normal? When I turn the A/C on it drops to 12.65. Thanks for your help. [moderator snip] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/