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New Alt, Low Voltage issues
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<blockquote data-quote="CplCuddles" data-source="post: 8650793" data-attributes="member: 663649"><p>Hey guys I'm back again with another issue,</p><p></p><p>I recently bought a <a href="http://www.mechman.com/alternators/buick/rainier/5-3l/2004-2006/320-amp-elite-series-alternator-for-gm-truck/" target="_blank">320 Amp Elite Series Alternator for GM Truck</a>. I was having dropping voltages into the 10s when I decided to buy a HO alt. I replaced my 130amp stock alt with the Mechman and left on my default belt to start. I then started having low voltage at idle issues.</p><p></p><p>My Tahoe idles at 500rpm, I'm told this is low, but it has done it since the day I bought it, no issues until now. My initial problem was that when idling (500rpm) I would drop into the high 10s when playing music. I tried to put on a smaller belt as I have seen that is recommended for the smaller pulley, I could not get a smaller belt to fit (even tried 1/2 inch shorter belt, it would barely not fit), So I have the original serpentine belt still on, it seems to be plenty tight. Figuring it was my batterys charge that was the issue, I bought a 750Mah trickle charger and left it on the battery overnight.</p><p></p><p>This solved the low voltage at idle issue, initially. A few days later on the 4th of July I had the key on and the stereo on low and my voltages were saying 10V dropping into 9.5V, somehow I turned on my Tahoe and it jumped back up to 14.7V. The next day I couldn't start my Tahoe and had to get it jumped, same voltage issue as the day before. I took my Redtop to O'Reilly to get it load tested, and it came out fine according to them.</p><p></p><p>Then yesterday a new problem emerged, while driving I noticed my rpms dropping below 500rpm. I let off the gas and let it drop to see how low it would go and it dropped to about 200rpm and all my lights dimmed out almost completely. I parked and revved for a minute and then turned it off (I was going inside) and it rested at 10.2V immediately after turning my Tahoe off. The low voltage issue seems to be somewhat intermittent was this point. My father who is a mechanic is adamant that it MUST be the alternator. Does this sound like something may be defective with the alternator I received or what else may be causing this? Thanks!</p></blockquote><p></p>
[QUOTE="CplCuddles, post: 8650793, member: 663649"] Hey guys I'm back again with another issue, I recently bought a [URL="http://www.mechman.com/alternators/buick/rainier/5-3l/2004-2006/320-amp-elite-series-alternator-for-gm-truck/"]320 Amp Elite Series Alternator for GM Truck[/URL]. I was having dropping voltages into the 10s when I decided to buy a HO alt. I replaced my 130amp stock alt with the Mechman and left on my default belt to start. I then started having low voltage at idle issues. My Tahoe idles at 500rpm, I'm told this is low, but it has done it since the day I bought it, no issues until now. My initial problem was that when idling (500rpm) I would drop into the high 10s when playing music. I tried to put on a smaller belt as I have seen that is recommended for the smaller pulley, I could not get a smaller belt to fit (even tried 1/2 inch shorter belt, it would barely not fit), So I have the original serpentine belt still on, it seems to be plenty tight. Figuring it was my batterys charge that was the issue, I bought a 750Mah trickle charger and left it on the battery overnight. This solved the low voltage at idle issue, initially. A few days later on the 4th of July I had the key on and the stereo on low and my voltages were saying 10V dropping into 9.5V, somehow I turned on my Tahoe and it jumped back up to 14.7V. The next day I couldn't start my Tahoe and had to get it jumped, same voltage issue as the day before. I took my Redtop to O'Reilly to get it load tested, and it came out fine according to them. Then yesterday a new problem emerged, while driving I noticed my rpms dropping below 500rpm. I let off the gas and let it drop to see how low it would go and it dropped to about 200rpm and all my lights dimmed out almost completely. I parked and revved for a minute and then turned it off (I was going inside) and it rested at 10.2V immediately after turning my Tahoe off. The low voltage issue seems to be somewhat intermittent was this point. My father who is a mechanic is adamant that it MUST be the alternator. Does this sound like something may be defective with the alternator I received or what else may be causing this? Thanks! [/QUOTE]
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