Quote:
Originally Posted by LongRider
Thank you, Frank. Optimusprime's reply had me confused (although he was kind enough to also reply to my question).
So, you are saying that the (+) side of the bulb is coming from the ""start"" switch and the (-) side of the bulb is, in fact, the field wire for the alternator? And, this wire, the blue wire, sometimes arrives at the "binding" post on the inner right front fender, so that I could, if this is the case, simply replace this wire from the binding post to the field wire spade push connection on the alternator? Yes.
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A bit of semantic clarification may be in order: The whole energizing circuit, including the bulb, blue wire, and binding post, are on the positive side. The "upstream" side of the bulb is the key switch side, the "downstream" side of the bulb (and blue wire) connect to the field of the alternator.
The word ""start"" has been placed in quotes because the bulb circuit is
NOT in the starting circuit. It is energized when the key is in the RUN position.
The bulb circuit reaches a ground through the alternator field when the alternator rotor is NOT turning. When the alternator rotor reaches operating speed, the + voltage at the D+ terminal very nearly approaches chassis voltage, hence the potential across the bulb is ~0, no current flows thru the bulb, and it is not illuminated.