John A higher amp alternator is only needed if you have certain conditions and problems. As alternators heat up, the voltage and current goes down. Then when you turn on lights, air conditioners, and fans come on then the voltage and current to charge the battery lessens. The more power your alternator has, the more it can keep up. Most general alternators today are 105 amp but they won't support the loads in certain conditions and they are working at full capacity. Thats why I have the De Lorean 140 amp and built others up to 180 amp for special applications.Our temp today in Dallas is 107 degrees, couple that with heat under the hood and engine heat, the load goes up and the alternator has to work harder. If you see your needle below the 13volt mark more than over, then you may want to question your system??????? John --- In dmcnews@xxxxxxxxxxx, John Yeoman <theshovel1224@xxxx> wrote: > Moderator's note: > This is a subject that, probably more than any other, dominates the archives. let's not forget to use them for some of these answers. > > > Hey List, If I were to put an aftermarket am/fm radio > with tape and cd player in my DeLorean, would I need a > more powerful alternator? I have the Motorola 90 amp. > If I would need a bigger one, what would you suggest, > a 105 amp, or a 140 amp? Thanks in advance. > > John Yeoman > > __________________________________________________ > Do You Yahoo!? > Yahoo! Mail - Free email you can access from anywhere! > http://mail.yahoo.com/