Low battery voltage light battery won't hold charge 2002 S60
Low battery voltage light comes on and battery won't hold charge...tested battery after light went on and it was only running at 10.4...drove a half a mile and stopped it and it is dead won't start. tried starting and got multiple clicking...returned 2 hours later and tried starting car and it started drove around for about 10 minutes light came back on again and here I sit.. hoping it may be just a voltage regulator? I read that they cannot replace the voltage regulator alone but that you need to replace the entire alternator? please advise. Thank you! KP
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Re: low battery voltage light battery won't hold charge...
Yup, time for a new alternator. Most models have the regulator built into the alternator, so it makes it a little bit more expensive - but it will resolve your problems. If you are driving at night with a load on your charging system (lights and radio on), you will probably notice you have dim headlights. If you don't change it soon, you'll end up having to replace your battery too.
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While the vehicl is running with a meter ,,check the voltage across the battery you should have 13.5 to 14 on the meter..You can have the battery load tested at autozone or advance for free..If the battery is bad and you keep jumping it off,,you will burn up the alternator ..Also when its running do you see a battery light come on,,thats a indication thats its not charging
The Battery warning light comes on because the Alternator output voltage has fallen below the voltage (about 12.8 volts DC) required to keep the battery charged, this low Alternator voltage causes the light to come on while this condition is happening. In your case unless the Alternator is tested while the battery warning light is on it will test ok/no problem. The battery itself doesn't turn the light on, only the Alternator malfunctioning. I would think you have a part called a "Diode" failing in the alternator or a wiring issue at the alternator connector(s), either way you need to isolate the problem, it will get worse and you will end up with a no start.
When you replaced the battery, did you have the alternator tested? The battery light indicates either the battery is not holding a charge or not receiving the proper power from the alternator to charge the battery. The brake lights could be a glitch but it could also mean that you are low on brake fluid or you have air in the brake system. Suggest you at least check the fluid level in the master cylinder and bleed the brakes.
Your battery is definitely low. First clean the terminals on the battery and the inside of the terminal rings on the wires. If you have a slow charger put it on that overnight and see if it holds a charge. If it still keeps depleting or doesn't charge overnight then either your battery or your alternator are done....possibly both.
So take the battery to have it load tested. Most places that sell them can test them. If the battery is done replace it then test the battery with a volt meter. If the old battery is still good put it back in the vehicle and test the voltage with a volt meter. With the engine off the voltage should read 12 volts (once its fully charged or if its new) with the engine running it should read around 14 volts. If it is way higher than that or it doesn't go up at all your alternator requires replacing. Alternators are fairly easy to replace but if you don't feel comfortable with that take it in to a mechanic.
Sounds like something is drawing the
battery down...The best test for this is.... Well before starting
this test make sure your doors are closed and everything is off. Then
...Take (disconnect) one end of the battery cable, the Positive or
negative it don't mater witch one. Put a 12 volt test light between
the two disconnected (cable and battery end)...now if the light is
lit, then you have a voltage drain somewhere...to find out were it is
you will have too start to remove your fuses one at a time until your
test light goes off...for example: if you pulled your cigaret lighter
fuse and the light went off then you know there is a problem with
This sounds a little confusing but it
is fairly easy..i sure hope this helps you out..Good Luck
Have the alternator and battery checked.
If the alternator isn't charging, that would cause the light to come on.
If the battery is bad and not holding a charge, do to a weak or dead cell, that would also cause the light to come on.
Voltage regulator is going bad. Have alternator tested or go ahead and have it replaced. Also this would be a good time to have the battery tested. Usually an alternator that is over charging will "cook" the battery causing it to not charge, not hold a charge, to losing the gel/electrolyte solution due to boil out.
i had the same problem with my dash saying battery voltage low and the problem was my alternator. took it to the dealership and it cost me $400.00 to replace a connector on the alternator because for my year car a (2002) they don't replace entire alternator.