Alternator question

Dhos1

Self-tuning wanna-be
Joined
Apr 14, 2012
What is the purpose of the plug that connects into the alternator. Not the one wirs post, but the pigtail connector...i believe it has 4 prongs
 
It goes to the dashboard idiot light. But it is super important. Won't charge without it
It excites the voltage regulator.
 
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