One of the terminals needs a constant 12V, usually provided by a jumper to the alternator output terminal. The other one provides the ground for the No Charge light when the alternator is not turning. During correct operation, the light should go out as soon as the alternator begins charging. Depending on the design of the internal regulator, it might be necessary to rev the alternator above idle speed once to kick in the charging current. Later model regulators will begin charging at idle speed.

I don't have a schematic handy at the moment to tell which terminal gets the constant 12 volts, but you've got a 50% chance of doing it right the first time. The rectifier eliminates the need for an isolation relay on the main charging lead- - -just connect it straight to the + terminal at either the battery post or the starter solenoid.
Jerry

Last edited by Hotrod Lincoln; 05/03/2008 8:51 PM.
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