Bocaj Posted November 9, 2010 Report Share Posted November 9, 2010 I have a strange voltage problem. When I pull up at a stop light playing music with about 1/4 volume my voltage sometimes reads about 11.9 volts at my 4 channel amp. When I hit the highway it goes up to about 13.5 volts, which I would expect, but what I don't understand is when I put my car in park and let it idle the voltage goes up to 13.5 and I can go full tilt and it only drops to about 13.4. I don't really understand how idling at a stop light is different than idling with my car in park. Hopefully someone can help me understand why this is happening. By the way my equipment is listed in my signature. Thanks, Jake Quote Car 1991 Honda Accord EX System I now have and is finally installed! Pioneer DEH-P7200HD Digital Designs 3512 Digtal Designs CS 6.5" components Audioque 2200 DD Audio C5b Optima Yellow Top Rockford Fosgate 1/0 Damplifier Pro Luxury Liner Pro Link to comment Share on other sites More sharing options...
anubis Posted November 9, 2010 Report Share Posted November 9, 2010 i need to know this answer as well Quote 1998 Monte Carlo Z34 Stock HU but have replacement Stock Highs Stock Electrical BTL 18 sitting naked AP1500D Link to comment Share on other sites More sharing options...
Chris from Mi Posted November 9, 2010 Report Share Posted November 9, 2010 the only thing i can think of is that if you have an automatic the load on the engine will make it rev a few hundred rpm lower if it is in gear than if it is out of gear, that extra little bit may be enough to keep your voltage up while in park Quote Orion 2500D, Jbl Gto 75.4 Team Wolfpack Audio FSQ 15" d2, mb quart xover, tweets peerless 6.5 mids Alpine cda-105 optima up front Knu klm 1/0 Link to comment Share on other sites More sharing options...
Kranny Posted November 9, 2010 Report Share Posted November 9, 2010 my car idles about 300rpm lower when in drive or reverse as opposed to park or neutral. i have voltage fluctuations like that also when changing from drive to park. it all matters on how fast the alternator is spinning. Quote Link to comment Share on other sites More sharing options...
FreekDesignz Posted November 9, 2010 Report Share Posted November 9, 2010 (edited) What's your voltage with your car off no volume. Also what's your voltage in park, drive and neutral? Edited November 9, 2010 by thafreek Quote ♠ FreekDesignz Demo Collection ♠ Everything You Need To Know About Car Audio Torres' Box Tuning Calculator Link to comment Share on other sites More sharing options...
Guest DC Power Kyle Posted November 9, 2010 Report Share Posted November 9, 2010 What vehicle Is it? Quote Link to comment Share on other sites More sharing options...
Bocaj Posted November 9, 2010 Author Report Share Posted November 9, 2010 What's your voltage with your car off no volume. Also what's your voltage in park, drive and neutral? This I am not completely sure of since my voltmeter only comes on when the head unit turns on. Also currently I can't access a DMM to test it. What vehicle Is it? 1991 Honda Accord. Quote Car 1991 Honda Accord EX System I now have and is finally installed! Pioneer DEH-P7200HD Digital Designs 3512 Digtal Designs CS 6.5" components Audioque 2200 DD Audio C5b Optima Yellow Top Rockford Fosgate 1/0 Damplifier Pro Luxury Liner Pro Link to comment Share on other sites More sharing options...
Guest DC Power Kyle Posted November 9, 2010 Report Share Posted November 9, 2010 Aftermarket alternator? Quote Link to comment Share on other sites More sharing options...
Bocaj Posted November 9, 2010 Author Report Share Posted November 9, 2010 Aftermarket alternator? No, stock alt. Saving up for aftermarket one. Quote Car 1991 Honda Accord EX System I now have and is finally installed! Pioneer DEH-P7200HD Digital Designs 3512 Digtal Designs CS 6.5" components Audioque 2200 DD Audio C5b Optima Yellow Top Rockford Fosgate 1/0 Damplifier Pro Luxury Liner Pro Link to comment Share on other sites More sharing options...
dugee81 Posted November 10, 2010 Report Share Posted November 10, 2010 i am going to go out on a limb here and say something is malfunctioning inside your alternator. my stock alt worked fine until one day, not sure what happened, it was just different. i popped the hood to find smoke rising, thought my alt was shot. at idle it would sit 12, sometimes dropping down to 11.9 if i had anything running (stereo, lights, heater, etc). but when driving around it would sit 13.6 or even 13.9 sometimes. i would look into getting a new alt before anything gets ruined, because it sounds like it isnt working properly Quote 200a alt. by Excessive Amperage hc800 under hood & 2 Deka 9a31 in rear 1/0awg + big 3 SAZ 3000D HDC3 18" @ 2 ohm Link to comment Share on other sites More sharing options...
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