Amart88 Posted April 18, 2013 Report Posted April 18, 2013 It probably has PCM regulated voltage... 2005 and up. My car did the exact same shit. I heard silverados of that year are the same way, the truck is in fuel economy mode and only raises the voltage when demand is needed. Thus the Alt kicks on and off alot. Try turning High beams and AC on see if the voltage goes up. My 2005 s10 blazer build. 4 zcon 18's walled.
SnowDrifter Posted April 18, 2013 Report Posted April 18, 2013 It probably has PCM regulated voltage... 2005 and up. My car did the exact same shit. I heard silverados of that year are the same way, the truck is in fuel economy mode and only raises the voltage when demand is needed. That's dumb... 12.8v isn't even enough to maintain a state of charge on the battery. What happens if you start turning on accessories like your lights, a/c, defrost, etc? ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444
Amart88 Posted April 18, 2013 Report Posted April 18, 2013 It probably has PCM regulated voltage... 2005 and up. My car did the exact same shit. I heard silverados of that year are the same way, the truck is in fuel economy mode and only raises the voltage when demand is needed. That's dumb... 12.8v isn't even enough to maintain a state of charge on the battery. What happens if you start turning on accessories like your lights, a/c, defrost, etc? I edited that, Turn on all of the accessories and it should go up to 13.8- 14's and when off goes back down to 12.7-12.9 and yes it is very stupid imo. My 2005 s10 blazer build. 4 zcon 18's walled.
Guest DC Power Kyle Posted April 19, 2013 Report Posted April 19, 2013 Read here: http://www.duboismarketing.com/pages/article.asp?id=31 completely normal, unfortunately.
Lbox88 Posted April 19, 2013 Report Posted April 19, 2013 Next time you see it drop, turn on your headlights. should start to tick back up. UBL | Build Log
Nico Shull Posted April 19, 2013 Report Posted April 19, 2013 The demands for emissions and fuel economy has lead to cars doing anything possible to save on fuel and limit emission output. Making your alternator work to maintain 14.6V ish takes more fuel than to let it sit around 12.6V until more is needed. It is all designed and programmed into your vehicle from factory these days. Takes some doing to change it! 2004 Ford Freestar SEL Jensen VM9224BT Alpine MRP-F257 "Flex 5" MBQuart ONX 1000.1D Factory Ford 5x7's (For now) 2 - MBQuart ONX304 12" Subwoofers
larrys95civic Posted April 19, 2013 Report Posted April 19, 2013 how about straight from the article from the guy who is in the alternator business: Suppose you have a customer with a 2005 Chevy Cobalt that comes to you complaining that his volt meter has dropped from around 14 volts to 13 volts. He thinks he has a bad alternator. You think that he might be right. At the least he has a charging system problem. Wrong!!! The RVC system is doing its job. The vehicle computer has made a decision based upon vehicle parameters that 13 volts is the most efficient set point on this vehicle. Replacing the alternator might create a different environment that would cause the set point to again be changed, but it could reset back to 13 volts as soon as the parameters are the same as before. Team Superior SPL Former Installer at Driven Sound & Security http://www.drivenss.com All kinds of forsale threads http://www.stevemeadedesigns.com/board/topic/164247-amps-subs-and-misc/#entry2383262 http://www.stevemeadedesigns.com/board/topic/164430-polk-audio-sda6000-sound-bar/#entry2386634 http://www.stevemeadedesigns.com/board/topic/164279-3-michael-kors-watches/#entry2383983 http://www.stevemeadedesigns.com/board/topic/164549-more-items-from-storage/ http://www.stevemeadedesigns.com/board/topic/166967-dd-9518s-amps-kenwood-custom-explorer-dash/ If someone is feeling generous I'd love an original sig LOL
lilone71742 Posted April 19, 2013 Report Posted April 19, 2013 I had this similar issue out of my 06 trailblazer. It just happened all of a sudden one day. When I bought the car and installed my system/voltmeter I would never go below 13.8 then I noticed it would dip to 12.7 within the last 2 weeks and this would be with audio system off. I just replaced my factory alt with a HO alternator and haven't had any issues as of now. Seems this fixed my issue but I'm not 100% sure this is the same. If you are looking to upgrade your alternator I would say go for it. 2006 Chevy Trailblazer ~ KX 1200.1 ~ 2 Skar VVX 15" ~Big 3 upgrade ~ Pioneer AVH 4100 ~ 275 Amp Singer Alt ~ PRV 6.5 front doors~ 6000K Hids
CNF Kevosinn Posted April 19, 2013 Report Posted April 19, 2013 mine does the same....2005 and up only charge if its below a certain point *** SuperSeller Status Verified *** ( http://www.stevemeadedesigns.com/board/topic/25829-super-sellers-buyers/ ) "kevosinn's" astro van 8 custom Sundown Zv4 18's 4 Sundown scv 6000's CNF Distribution CNC parts Skyhigh wire some batteries SMD Meters and tools used on the installhttp://www.stevemeadedesigns.com/board/topic/172877-kevosinns-vanwest-coast-skyhigh-car-audio-vehicle/ 16,000 watt walled silverado build.http://www.stevemeadedesigns.com/board/topic/161965-walled-silverado-4-hdc4-15s-4-crescendo-3500s-and-much-more/ 8,000 watt 1999 Subaru legacy outback. Build log here: http://www.stevemead...ru/page__st__60TEAM CNF Distribution
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