Alternators ARE meant to run all the time (just not 100% of the time at full rated output). One of the problems with the Delorean was the origional alternator was not big enough and it was in an area where it doesn't get enough cooling air. Getting a bigger alternator helps but only to a point. Without enough cooling a bigger alternator will only get hotter! The alternator has to be balanced with the battery and they BOTH have to be sized to handle the expected loads of the electrical system. Generators were not meant to recharge a dead battery either, only replace what was used to start the motor and carry the load of the system while the motor runs. The Ducy couldn't handle the loads on brand new cars! The heat killed them. As an alternator gets hot it's rated output drops, the Ducy was too small to begin with! And that was with new batteries! BTW islolators on dual battery systems are NOT meant to isloate them from being charged, only drained. That way even if you kill one of the batteries you still have one to restart the rig. This thread is getting away from Delorean specific. For further info on designing automotive electrical systems there are many good books you can refer to. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote: > > Sorry Dave, > An alternators job is not to charge the battery like the old generators did > but to top them off. If you have a good battery and it's low sure the > alternator will top it off but if you barely can start the car and you think > the battery will be fully charged when you get to the destination t 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/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> 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/