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<blockquote data-quote="1aespinoza" data-source="post: 8847065" data-attributes="member: 654802"><p>I assume the alternator has a 4 wire harness. AFAIK, chevy alternators are ECU controlled. The fact that you got above 13.8v is beyond me. Others here have 15+ resting voltage but they use lithium cells and whatnot. </p><p> I recall a member here had the same issue and he traced it down to the exterior ambient temperature sensor. They told him the high reading caused the computer to lower the output to protect the alternator or battery.</p><p> The fix had something to do with reprogramming the ECU in some way beyond my knowledge. I'll try to find the thread.</p></blockquote><p></p>
[QUOTE="1aespinoza, post: 8847065, member: 654802"] I assume the alternator has a 4 wire harness. AFAIK, chevy alternators are ECU controlled. The fact that you got above 13.8v is beyond me. Others here have 15+ resting voltage but they use lithium cells and whatnot. I recall a member here had the same issue and he traced it down to the exterior ambient temperature sensor. They told him the high reading caused the computer to lower the output to protect the alternator or battery. The fix had something to do with reprogramming the ECU in some way beyond my knowledge. I'll try to find the thread. [/QUOTE]
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