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Trouble staying at 14v
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<blockquote data-quote="shizzzon" data-source="post: 8496825" data-attributes="member: 590338"><p>I would get an ammeter and clamp the alternator at max output on sine wave to see how much current is coming out of the alternator, then do the same with the battery.</p><p></p><p>Perhaps a section of the rectifier is gone in the alt..</p><p></p><p>2nd, it just started getting warmer in the colder states recently.</p><p></p><p>Colder weather allows charging system to charge at higher voltages.</p><p></p><p>PCM controlled alternator probably doesn't want to even be above 13.8v on warmer days.</p><p></p><p>Dropping into 11s even if everything was perfect sounds like either you have no battery in the rear or your FRAME is terrible and you need dedicated ground run from front to rear to maintain charging while under load.</p><p></p><p>I would also manually charge the AGM using the correct charger just to ensure the battery is topped off, especially since it's already dug into the 11s recently.</p><p></p><p>I would also load test the battery too.</p><p></p><p>If i remember correctly, a 100A load test on a fresh charge should show mid 11s on drop with slow rise to high 11s.</p><p></p><p>XS Power can confirm this, i'm just rattling it off from memory.</p></blockquote><p></p>
[QUOTE="shizzzon, post: 8496825, member: 590338"] I would get an ammeter and clamp the alternator at max output on sine wave to see how much current is coming out of the alternator, then do the same with the battery. Perhaps a section of the rectifier is gone in the alt.. 2nd, it just started getting warmer in the colder states recently. Colder weather allows charging system to charge at higher voltages. PCM controlled alternator probably doesn't want to even be above 13.8v on warmer days. Dropping into 11s even if everything was perfect sounds like either you have no battery in the rear or your FRAME is terrible and you need dedicated ground run from front to rear to maintain charging while under load. I would also manually charge the AGM using the correct charger just to ensure the battery is topped off, especially since it's already dug into the 11s recently. I would also load test the battery too. If i remember correctly, a 100A load test on a fresh charge should show mid 11s on drop with slow rise to high 11s. XS Power can confirm this, i'm just rattling it off from memory. [/QUOTE]
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Trouble staying at 14v
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