Alternator

[H2Ogbodies]

Thats the alt. from a 94-96 Impala SS and has a 6" dia. case-won't fit a lot of engines without a couple mods. As for specifics, i would advise you to add up the max. draw of all of your components and I mean everything-then, figure you should be running an alt. that puts out 70% of that figure @ max. output. This way, you are assured of not taxing the charging system and overworking the regulator and overheating the diodes.

[hifi875]

you do not want to do a autozone/pepboys/ style alternator. if you need a high output alternator get a powermaster. One that puts out alot of current at idle, not max. the parts store alternators that say put out 105 amps usually only do about 40 or so at idle. a powermaster 140 amp will do 90+ usually at idle. electric fans/audio/vehicle electronics can consume alot of power and most of them need 12v to operate properly, not 10 or 11

[68Formula]

As for specifics, i would advise you to add up the max. draw of all of your components and I mean everything-then, figure you should be running an alt. that puts out 70% of that figure @ max. output. This way, you are assured of not taxing the charging system and overworking the regulator and overheating the diodes.

X2

Don't know what year you have, but if you consider what was available back in the 60s, you can easily overtax the system.

Once you start adding things like a stereo and amplifier, electric fan(s), electric fuel pump, EFI, better headlights, power accessories, etc. you'll go over. Add up everthing (include options you plan in the future) and that will tell you what you really need.

Keep in mind the alternator is moving slowest at idle, therefore providing the least amount of output. Older wiring can also increase resistance adding load to the system.