DO NOT put in a Great Big Alternator before you read and heed this:
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
There is only one source "under the hood" for switched 12V "run"........and that is the "ignition run" line, known also as "IGN 1". This is what the alternator field (blue), the original VR power (blue) and ignition power, as well as electric choke if used, and on some cars, "smog doo dads" such as idle solenoid or distributor retard solenoid.
