Need advice on Alternator wiring from wiring guru's

[shomethe$$$]

My alternator stopped working today, its not charging at all, the only thing I can think of is that the voltage regulator burned out because I didn't wire the alternator correctly. Recall, I swapped SHO engine in my Prelude

The alternator was always charging unusually high at 14.9-15 V for the passed 3000 miles but I thought nothing of it

on the alternator it says I S A, but I only see two prong's on the alternator
I -did not wire, (goes to gauge cluster bulb and resistor)
S-no prong?
A-wired to batt +, 10 amp fuse

What I'm asking is how does the system regulate the voltage?
Does the alternator need a ground?
Why is the indicator bulb or resistor important?
so confused, why has it stopped charging?



here is a link, perhaps someone can make sense of it
http://www.electricalrebuilders.org/techlib/techbasics/0604techbasicsford2g.pdf

 

[shomethe$$$]

ok, I think I have it figured, its the charge light bulb, I just checked on the car once I connect the charge light bulb the alternator tries to charge because the engine rpm twitches but I think the brushes are worn so much that it just can't charge anymore, I'm posting on the WTB section

 

[shomethe$$$]

I replaced the alternator and made sure I hooked up the warning light, so next time anyone doing some wiring, the bulb and the reisistor, has to be in there, I think its a 7 Ohm 4watt bulb.

Charges correctly now at 13.5 volts, alternator was expense but with a 3 yr warranty for $150 and change.