a.lim Posted December 18, 2011 Share Posted December 18, 2011 My brake light and battery light has been on ever since I replaced my alternator and I'm convinced it is a bad rebuilt alternator. The battery voltage is 12.0-12.1 when the key position is on the Accel positon and when the engine is idling it reads around 15.5 volts. Is that abnormal? Link to comment Share on other sites More sharing options...
ericem Posted December 19, 2011 Share Posted December 19, 2011 more hp Link to comment Share on other sites More sharing options...
bmx045 Posted December 19, 2011 Share Posted December 19, 2011 http://s3.amazonaws.com/kym-assets/photos/images/original/000/131/399/fry.PNG?1307468855 Link to comment Share on other sites More sharing options...
contractkiller Posted December 19, 2011 Share Posted December 19, 2011 just checked mine, 11.6V with acc., 14.0V @ idle. Did you have the brake and battery lights before the alternator was replaced? what did u mean when you said. it felt like i was driving a civic? did u mean the car felt like it was more dependable and it was getting better mpg's? Link to comment Share on other sites More sharing options...
bmx045 Posted December 19, 2011 Share Posted December 19, 2011 15.5 is high. However you can use the extra 1.5 volts to power your seat back massager. Link to comment Share on other sites More sharing options...
shadowsports Posted December 19, 2011 Share Posted December 19, 2011 Me 11.8v ACC, 14.2v idle. Like bmx045 stated, 15.5v is high. The regulator circuit in your rebuid doesn't appear to be doing its job? Link to comment Share on other sites More sharing options...
ouch1011 Posted December 19, 2011 Share Posted December 19, 2011 15.5v is high. Most of the electronics in your car are designed for 12-14v. 15.5v is not likely to damage anything, but it is too high and will over work the alternator and may cause excess heat in the battery. Link to comment Share on other sites More sharing options...
byronchrisp05 Posted December 19, 2011 Share Posted December 19, 2011 But if the regulator is not working with it at 15.5 @idle who knows how high the voltage is getting driving it Link to comment Share on other sites More sharing options...
scoobyscoodle Posted December 19, 2011 Share Posted December 19, 2011 Industry standard is 14.4v. Have you checked the voltage once the car has warmed up? Was your alternator rebuilt or did you replace it with a refurbished one? Link to comment Share on other sites More sharing options...
HCF Posted December 19, 2011 Share Posted December 19, 2011 Confident the meter you are using is accurate? Im assuming the alternator is from a parts store that will be able to test its voltage.. drive it up there and see what they read. If it is high, have them give you another one. At least its about the easiest thing to replace on the car. How long did your original one last? Link to comment Share on other sites More sharing options...
planelazy Posted December 19, 2011 Share Posted December 19, 2011 Your voltage regulator has probably flown the coup.. as said before, 14.4 is pretty much the most you want. The battery is 12 volts, the alternator is 14 volt (to run shit and charge the battery) and while the car is running, the regulator should keep it at 13.5-14.4 volts. I have no clue where it is on the car... it could be built into the alternator. Link to comment Share on other sites More sharing options...
a.lim Posted December 21, 2011 Author Share Posted December 21, 2011 its says around 15.5 driving. i logged on the cobb ap. alternator is a crappy napa rebuild. voltage regulator must be bad.. Link to comment Share on other sites More sharing options...
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