SCR34M3R Posted November 12, 2006 Share Posted November 12, 2006 (edited) hay guys i will start from the beginning, i put a stereo in my car (R34 sedan) over the weekend, and when i was tuning it i didnt start the car, which ended in a flat battery, so we push started it. battery is fully charged again but when car is running it shows 15.8volts which i was told the alternator is overcharging. has ne one got ne ideas how to fix this? or do i just buy a new alternator? Cheers Edited November 12, 2006 by Raistlin Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/ Share on other sites More sharing options...
Race_Bred Posted November 12, 2006 Share Posted November 12, 2006 you'll have to pull it out and give it to an auto electrician to be repaired or recoed or replaced, either way its gotta come out Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2663464 Share on other sites More sharing options...
grim32 Posted November 12, 2006 Share Posted November 12, 2006 hay guysi will start from the beginning, i put a stereo in my car (R34 sedan) over the weekend, and when i was tuning it i didnt start the car, which ended in a flat battery, so we push started it. battery is fully charged again but when car is running it shows 15.8volts which i was told the alternator is overcharging. has ne one got ne ideas how to fix this? or do i just buy a new alternator? Cheers First i would try turning off all the stereo, amps etc etc and see if it charges at the correct rate, 14.1 when cold and about 13.6 volts when warm. The reason i say this is because you may have tapped into the voltage sence wire somehow so the alternator thinks the battery is low on voltage and will throw out a higher rate of charge. Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2664092 Share on other sites More sharing options...
SCR34M3R Posted November 12, 2006 Author Share Posted November 12, 2006 First i would try turning off all the stereo, amps etc etc and see if it charges at the correct rate, 14.1 when cold and about 13.6 volts when warm.The reason i say this is because you may have tapped into the voltage sence wire somehow so the alternator thinks the battery is low on voltage and will throw out a higher rate of charge. just tryed that didnt change but it is sitting at about 15.48-9volts with battery light on all the time Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2664260 Share on other sites More sharing options...
grim32 Posted November 13, 2006 Share Posted November 13, 2006 just tryed that didnt change but it is sitting at about 15.48-9volts with battery light on all the time Try unplug the the 2 pin plug on the alternator and see what happens Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2667005 Share on other sites More sharing options...
700HP-GTR33 Posted November 14, 2006 Share Posted November 14, 2006 I have seen batteries explode...get it fixed by an auto elec. Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2671868 Share on other sites More sharing options...
blur Posted November 15, 2006 Share Posted November 15, 2006 ive seen every bulb blown, ecus, clocks, stereos the whole lot fried from overcharging, get it fixed ASAP, DONT DRIVE IT !!!!!!!!! Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2675810 Share on other sites More sharing options...
d00dz Posted November 15, 2006 Share Posted November 15, 2006 It seems that on my PFC the battery volt is approx between 14.8-15.3. I havent had any problems with the car's electrics or anything. Would this be an issue? Alternator? Battery? Also it seems as though when I turn on my headlights the voltage drops approx 0.5-0.9volts. Hmmmz.. Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2676558 Share on other sites More sharing options...
700HP-GTR33 Posted November 16, 2006 Share Posted November 16, 2006 I have seen batteries explode...get it fixed by an auto elec. As in explode in the engine bay . Take it serious if you don't want things to melt ...stop messing with it and get an auto elec....please, your killing me. Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2679234 Share on other sites More sharing options...
tridentt150v Posted November 17, 2006 Share Posted November 17, 2006 Get your battery checked, if it has a faulty cell you will have an open circuit. The alternator thinks it is charging a flat battery so max's the voltage. BTW your battery will not hold a good charge if this is the case. Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2681915 Share on other sites More sharing options...
SCR34M3R Posted November 18, 2006 Author Share Posted November 18, 2006 i got a new battery which it was stuffed, but still same thing is at about 15.4volt so taking it to auto elec when i get home Link to comment https://www.sau.com.au/forums/topic/142935-overcharging-alternator/#findComment-2683059 Share on other sites More sharing options...
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