my battery on my car is overcharging.. ??

Question

the battery light was on permanently and battery is overcharging. have changed the alternator but although the battery light has gone off now the reading is that something is still overcharging my battery.. i have a 1996 nissan almera can anyone help?

Answer 1

It should read about 14 volts when charging properly. If the alternetor has a built in regulator as most do then if it really is overcharging you have a new alternator with a dodgy regulator.

Answer 2

The only thing that charges your battery is the alternator. The red light meant that the old alternator was dead, so it was correctly replaced. The alternator has to put over 12 volts into the battery as exactly 12 volts would not do the job at all. It is doubtful if a change of alternator would cause any kind of overcharge as this is regulated electronically. Unless your battery has been damaged by overcharge, which usually presents as distorted internals showing as bulging sides, I should forget it. The link below explains.

Answer 3

You Bet That's a big Yes and the gases are explosive its hydrogen, make sure the batter has water in it no special water just wate some people will say only use distilled thats was in the 1920 not on todays batterys , everytime you charge a battery the lead grid plates shed, the faster you charge or more amperger it sheds faster, batterys are only good for so many so called fast charges , in a normal charging system, the voltage regulator controls this and shuts down the alternator from over charging this is why its called a voltage regulator, Now if you are haveing to charge your batter ever night you most likely and a charging syndrom, a draw on the battery. either a dead sell in the batter or the if intergal type alternator a bad regulator if non intergral it can be tested by by passing to see if the system is in fact charging, when the amps are up the volts are down , when the volts are up the amps are down this fact on any vehicle in the world ,or charging systeml as we know theml now if your useing this battery in a motor home or RV or for anything other than a vehicle then you need a deep cylcle type battery, made for constat charging and re charging I have no information on what kind of vehicle if any we are talking about, just charging question ?need to know whats if for what kind of vehicle does it have an alternator or gen, you can charge over night as long and its only a trickle charge, if your useing a big charger over 20 amps yes and does not shut off automaticly you will eventuly burn up the batter and the way to tell is with a carbon pile or load tester, all cell must bubble when charging, and none when takeing current out, if a cell bubbles when removing current that cell is dead and your batter is junk, garenteed 100%

Answer 4

You've changed the alternator,now what made you conclude that the battery is overcharging?

Does the battery solution bubbles too much? While the engine is running, the terminal voltage of the battery should be between 12.5V to 14.6V. depending on the rpm of the engine. If the voltage reaches 15-16Volts ( steady reading) then that's the time you can say the battery is overcharging.

When the light turns off, then it is not overcharging. When the light is always "on", your battery is not charging.

Answer 5

If the battery is an old one then its resistance rises this causes the alternator voltage to rise to try to charge it this will eventually burn out the voltage regulator which is probably what happened to your old unit.get another battery and connect it with a pair of jump leads to your battery leads start it up and check output voltage should be about 14.5 volts at any rpm.Its a bloody alternator not a dynamo and control transistor sets output voltage not engine speed

Answer 6

Take your car to Auto-zone, Pep boys, Auto Advance or any chain and they will test your electrical system for FREE (don't let them try to charge you or suggest that you tip them). You may have to wait if they're busy but a reputable business will be honest with you and only suggest parts if you really need them. Try going to a few of them and getting 2nd and 3rd opinions. Make sure to tell them if you have done anything with your cars electrical system in the last 12 mos. Added a new stereo or amplifier, etc. Good-Luck!

I just saw that your in the UK, boy do I feel dumb, do ya'll have wal marts across the pond? (wal mart should be your last choise, they suck)

Answer 7

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Answer 8

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Answer 9

What makes you think the battery is being overcharged?

Answer 10

I have heard of this before. I believe the fault will be in the wiring of the fusebox under the bonnet. I would find a good auto electrician to look at this for you.

Answer 11

when you was at shop or parts store having it tested

what was the reason they gave you

over charging a faulty alternator