kentb Posted May 8, 2008 Author Report Share Posted May 8, 2008 i just got an oil change about 2 months ago Quote New System 2 10" Fi SSD, Sundown 1500d Build I build and design enclosures(cheap price), PM ME Kicker L7 Navigator(plexiglass, fiberglass, aeroport) Build BTL 18" Escalade(plexiglass, battery tray) Build http://www.kentbaudio.com Old System Link to comment Share on other sites More sharing options...
kentb Posted May 8, 2008 Author Report Share Posted May 8, 2008 what bugs me is that after i got to work my alternator was still working perfectly then i got home, rest for a bit then went out again. then the batt problems suddenly showed up it was just a span of 3 hours with the car turned off. Quote New System 2 10" Fi SSD, Sundown 1500d Build I build and design enclosures(cheap price), PM ME Kicker L7 Navigator(plexiglass, fiberglass, aeroport) Build BTL 18" Escalade(plexiglass, battery tray) Build http://www.kentbaudio.com Old System Link to comment Share on other sites More sharing options...
Jextel Posted May 8, 2008 Report Share Posted May 8, 2008 so i got:optima yellowtop under the hood kinetik hc2400 on the back iraggi 240/165 amp alternator it was running fine for about a week since i installed it, my voltages were: 14.2@idle, 13.4v w/ engine off this morning it was running fine too so when i was leaving this afternoon, i noticed the battery gauge was pretty low i checked the voltage and it was only 12.7 while the car is idling and system is off so i turned my car off and checked the voltage, it was 12.8 so i disconnected my powerwire that runs to the back battery and the amps after about half hour driving i checked the voltage, while idle it was 12.3 when it was off it was 12.5 what do you guys think? did my alternator died? i checked all the wire connections and it seems that its good I had this problem with my second alt from iraggi but it only lasted less than one song im on my third and volts get as low as 11.7 just like my stock alt....im in the same boat as you im just ready to get another alternator from OG or EA Quote http://www.cardomain.com/ride/3042878TEAM DEADLY HERTZ "GET LOUD OR DIE TRYIN"only the loudest will survive. Link to comment Share on other sites More sharing options...
Decaf Posted May 8, 2008 Report Share Posted May 8, 2008 this happens with HO alts, they produce alot of power once engaged, and dont turn on usually until under a load or at 800-1000rpm so at idle, it should read 12.8ish, and with car off it should be right around there to so test voltage when someone has the throttle enganged, it should read up to almost 15 volts at 2000+ rpm that will let you know if its the alt because if its producing plenty of power once enganged the problem is that the regultator is off until a load is present... which techincally isnt a problem, more of an annoyance ive rarely seen a battery sit at 13.4 unless it was on a charger on "float," remember they are 12v batts, so batts shouls sit from 12-12.9 since theres and extra .1 -.2v extra per cell produced so ideally car off bat should say 12.8 car on, at idle, should be low 13 if not still 12.8 throttle engaged should be 14.4ish full tilt with throttle engaged at ~2000rpm should be above 13 with the upgrades u have this happens with EA alts also Quote Link to comment Share on other sites More sharing options...
Matt Young Posted May 8, 2008 Report Share Posted May 8, 2008 this happens with HO alts, they produce alot of power once engaged, and dont turn on usually until under a load or at 800-1000rpmso at idle, it should read 12.8ish, and with car off it should be right around there to so test voltage when someone has the throttle enganged, it should read up to almost 15 volts at 2000+ rpm that will let you know if its the alt because if its producing plenty of power once enganged the problem is that the regultator is off until a load is present... which techincally isnt a problem, more of an annoyance ive rarely seen a battery sit at 13.4 unless it was on a charger on "float," remember they are 12v batts, so batts shouls sit from 12-12.9 since theres and extra .1 -.2v extra per cell produced so ideally car off bat should say 12.8 car on, at idle, should be low 13 if not still 12.8 throttle engaged should be 14.4ish full tilt with throttle engaged at ~2000rpm should be above 13 with the upgrades u have this happens with EA alts also The above description is pretty correct. The main reason why the voltae is low at idle. is because at that RPM a high output alternator usually doesn't put out much amperage. Bring the RPMs on the motor up and see if the voltage comes up. You can tell if the belt is slipping by carefully feeling the temerature of the alternator pulley after the vehicle has been running for a while under a heavy electrical load. If the alternator pulley is noticibly hotter than the rest of the alternator, or if it looks discollored or black on the belt contact area, you have a belt slip problem. Changing the oil has ABSOLUTELY nothing to do with an alternator or belt slip problem. Quote Link to comment Share on other sites More sharing options...
kentb Posted May 8, 2008 Author Report Share Posted May 8, 2008 tried that too when i rev it up it actually drops about .01-.04 volts im gonna bring it up to a mechanic today. i hope my alternator is still good i noticed that my battery is not charging, everytime i check the voltage it slowly goes down. Quote New System 2 10" Fi SSD, Sundown 1500d Build I build and design enclosures(cheap price), PM ME Kicker L7 Navigator(plexiglass, fiberglass, aeroport) Build BTL 18" Escalade(plexiglass, battery tray) Build http://www.kentbaudio.com Old System Link to comment Share on other sites More sharing options...
missinglink Posted May 8, 2008 Report Share Posted May 8, 2008 tried that toowhen i rev it up it actually drops about .01-.04 volts im gonna bring it up to a mechanic today. i hope my alternator is still good i noticed that my battery is not charging, everytime i check the voltage it slowly goes down. Your alternator is not charging. A drop in voltage from resting to running indicates that you are taking power from the battery, not charging it at all. You could have a bad regulator, failed brush, broken wire, a couple of open diodes... The list of possible failures is long. I doubt you have a belt tension issue if you have a serpentine belt with the OEM tensioner. Some alternators have a self-test capacity. Is this a Ford alternator? 'Link Quote missinglinkaudio The United States Marine Corps. When it absolutely, positively has to be destroyed overnight - even if "it" belongs to the base commander... Link to comment Share on other sites More sharing options...
kentb Posted May 9, 2008 Author Report Share Posted May 9, 2008 the mechanic said the alternator was bad. i got a new one from autozone and got it installed, it worked perfectly no problems at all. it even fixed my battery light indicator which lighted up all the time the iraggi alt was in. i talked to iraggi he seemed like a nice guy, im send it back to him, i hope everything is good. does anyone know if i can put 2 alts in my explorer? Quote New System 2 10" Fi SSD, Sundown 1500d Build I build and design enclosures(cheap price), PM ME Kicker L7 Navigator(plexiglass, fiberglass, aeroport) Build BTL 18" Escalade(plexiglass, battery tray) Build http://www.kentbaudio.com Old System Link to comment Share on other sites More sharing options...
cichlidfort Posted May 9, 2008 Report Share Posted May 9, 2008 Take a picture your engine and post it. Quote 2008 Chevy Impala (undercover cop style) Setup in the makings Link to comment Share on other sites More sharing options...
mrrairai Posted May 10, 2008 Report Share Posted May 10, 2008 I guess I'm late but I was gonna say that your alt is bad. I had that same problem a few years back with the same symptoms on my Expedition. Glad you got in contact so you can get it taken care of. I always keep my stock alt handy just in case tho. Quote Member since 25 Jun 2006 2011 Yukon DenaliCustomLightz 4300K HID RetrofitEsky TailsEsky Third BrakeEsky 22sEsky Appliques Link to comment Share on other sites More sharing options...
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