Question about 2000 Mazda MPV

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Battery light still on and I replaces alternator 10 times

I have the same problem have you been able to fix yours I replaced the alternator around 10 times and keeps on killing the battery please email me and let me know thanks hillihill@yahoo.com

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If the altenator and battery check good. i'd say you have a draw on the battery. can be very hard to find at times.

Posted on Oct 03, 2009

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Have your battery load tested, even the best alternator cant charge a bad battery,also try starting the car then remove one of your battery cables and see if it keeps running,if it does than your alternator is working properly

Posted on Oct 03, 2009

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First my ac fan was not blowing as hard as normal still cooling just not blowing, then two days later my battery warning light came on,10 minutes later while running the electrical system just shut down....


Sounds like the alternator has gone bad. Jump start the car and check the voltage at the battery. You should see around 14 volts if the alternator is working. If you see around 12 the alternator is not charging.

Labor rates and parts pricing various greatly depending on where you are. Your best bet to find the most accurate pricing for your area would be to call some local shops to get some phone quotes.

You can expect anywhere from $300 to $600 to have the alternator replaced at a shop. If you do it yourself you can expect to pay $100 to $275 for the alternator at a parts store.

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Problem could be the alternator ( battery charger), seems like it doesn't charge battery.
You can test it With a DC meter , with your van Stopped mesure DC voltage (should be around 12 V) , when running should be around 13 V (Depending on the regulator) .
Hope this help you to fix your issue

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Battery light goes on and off


Your running the alternator on borrowed time as its a matter of time before the battery dies and needs replacement along with the old alternator. The light is indicating something wrong with the electrical system. A simple test at your favorite auto store capable of checking the battery/alternator system will reveal what's wrong or you can perform some simple measurements of battery voltage to determine the issues - the alternator is due for replacement and possibly the battery if it was allowed to operate with the battery light going on and off for a long time otherwise the alternator is on its last legs unless you can find loose connections on the alternator.

Usually alternators wear out; the brushes wear down after so many thousands of miles where they begin to lose physical contact and intermittently turn on the low voltage indicator warning you of electrical power problems. Measuring at the battery terminals should show battery voltage around 12.5v+, engine idling 13.5v+, above idling 14.3v+. If the last two voltages don't vary above battery voltage then the alternator is faulty. Remove it for testing before replacement. With so many miles on it, its due for replacement.

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No problems starting car (92 Camry) but 'Charge' light came on and stayed on. It has never done this before. Drove home (about 30 minutes), light stayed on the whole time. No hope of getting anyone to...


you can check the alternator by using a digital voltage meter (usually can be found for less than $15)-voltage at rest (after sitting overnight) should be about 12.5 volts, running should be around 15 volts at startup, dropping down to around 14 at idle. Measure at the battery terminals and the back of the alternator, readings should be pretty much identical. I suspect your alternator is bad-you have a Nipondenso alternator, I just replaced my neighbor's and got a rebuilt unit for less than $100, they are very easy to replace by the way. You should check a few things first before getting another alternator-there are charging fuses and relays in the power center under the hood and by the driver's left foot-check them, just in case one has blown. Also, there is an 80 amp fuse right off the positive terminal of the battery-it is bolted into place, you have to disconnect the battery and the sides of the housing for this fuse has plastic 'doors' on the side you pop open for access to the bolts that hold the 80 amp fuse-remove the outer fuses, remove the bolts, it then just pulls out. You can find these fuses at most parts stores for less than $4.

To get yourself by if you can't get an alternator or don't want to replace it yourself, you can buy a battery charger (needs to be a 10 amp charger, automatic is better since it will not overcharge your battery, about $30 or less)-hook it up to your battery when you are not going anywhere, and you will be able to take SHORT trips, running strictly off the battery. If you use lights your ability to travel will be shortened considerably-even using the radio is using battery reserve, so limit all accessories (heater fan too) and don't travel too far, you can only do this for a brief time.

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2 Answers

Chevy Suburban 1500 -- Battery Not Charging Light....Replaced Alternator....Still had battery not charging light....Replaced battery....Still have battery not charging light...also first time seen service...


Make sure that you buy a 'lifetime' warranted alternator from your parts source to avoid problems with bad alternators out of the box. I would try to return and exchange the alternator with one that tests out ok on a bench, in order to verify if the wiring in between the alternator or the alternator itself was bad.

Service brake booster would have to do with the vacuum or power booster problem around the master cylinder for the braking system. That wouldn't have anything to do with the alternator, I do not believe.

Good luck on these repairs.

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1 Answer

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How odd that you would replace a battery or stater, when obviously it is the alternator that is supposed to keep the battery charged.
Also make sure the battery terminals are clean and greased, the belt is tight, the engine ground strap it on, the alternator warning light is not burned out, and there is no short smoking somewhere.
The way you test an alternator is to put a voltmeter across the battery.
It should read 12.5 off.
When you try to crank, it should drop around 10.
When it starts it should come back up, and reach over 13.5 when you rev it up.
Going over 14.5 is too much and also means the alternator needs replacement.

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2 Answers

Low battery voltage light battery won't hold charge 2002 S60


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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Sounds like a bad alternator, charge battery, check voltage without car running (should be around12v) start engine (voltage should be between 13.50- 14.5v) , check and make sure alternator belt is ok also.

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It is cheaper and more reliable to replace the alternator than to rebuild the one in the car.

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