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NW Washington | I think he is referring to the alternator field current circuit as the "trigger" line. This is 12 volts dc that comes from the battery via the ignition switch the excited the alternator fields so that it will charge initially. Without this voltage the alternator will not charge.
Check this link for a better explanation and maybe a clue to why your alternator is not working. http://www.alternatorparts.com/understanding_alternators.htm | |
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Nissan Frontier not charging.
