1. This is the main power wire that goes directly to the battery. Make sure it is a
heavy gauge since it has to carry the full output of the alternator (up to 100 amps).
2. This is the field wire that energizes the alternator. It must be switched, or else
it will drain the battery overnight. Do not wire this into the coil power wire that you
use to switch the engine on & off (a seemingly elegant solution), since once the engine
is running the alternator will feed power back through this wire, which will then power
the coil, & you won't be able to shut your car off.
3. This is the lead for the sensing wire that goes to the idiot light in your instrument
panel. When this light lights up you know that your the alternator has just stopped charging.
4. This is the regulator bypass hole. Sticking a long thin metal object about 2 inches deep
into this D-shaped hole causes the alternator to go to full charge. If you do this while it's
dark out & the main power wire is disconnected, the whole alternator will emit a cool X-Files
type glow. I don't recommend that you try this since you'll likely end up toasting your alternator.
