Question about 2006 Mazda 3

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Use a digital volt meter across the battery terminals while the engine is running. It should read 13.5 volts DC or higher. If not your alternator is bad. I hope this helps.

Posted on Sep 08, 2010


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07 pontiac Grand Prix won't start even with a jump. An says charging system fail on message center.

It takes a lot of time to charge a really dead battery. When you try and start the car with a dead battery installed there is a large voltage drop across your jumper cables so you must achieve a reasonable amount of charge on the battery before you can turn over the engine even with the jumper helping. If you are losing charge on your battery in a short period of time you may have a failed voltage regulator, a bad battery, a bad alternator (should be putting out 14 volts DC or so) or bad connections. You could replace the battery (with a charged one) as a test to determine that the car will start. If it starts OK than read the voltage on the battery terminals while the car is running to check the alternator and regulator.

Oct 08, 2014 | Cars & Trucks

1 Answer

Battery good, alternator good, starter good but my 1966 oldsmobile the alternator isn't charging the battery

Have you replaced the voltage regulator?
Unless you have changed the charging system and eliminated it, the alternator does not have a built-in voltage regulator like the newer ones do.
Be blessed.

Feb 06, 2013 | Cars & Trucks

1 Answer


Every car ever made has a voltage regulator

The alternator is just that-- AC Current that is rectified
to DC-- to run the car & charge the battery

Just about every car for the last 40 years has the
regulator inside the alt

How it is controlled varies from manufacture,make,

You can not charge a defective battery

You may have external issues that provide
regulator control,even a bad ignition sw on
some cars,or module control of regulator

Need a wiring diagram & a good amount of
knowledge to resolve your current problem

Jan 24, 2013 | 2001 Ford Taurus

1 Answer

I have a 2000 lincoln towncar limo car was running greati stopped to get gas and when i went to start i had no power.i boosted car and got it home,changed battery but i still have no power at all (even...

Hello info49624

you have done everything right so far. now since what you have done didn't work. This could only mean that your Alternator is no longer working. The purpose of the alternator is to keep the battery charged up so all your car functions work. The alternator stands by to restore the electrical charge used to crank the engine. It , once the engine is running, charges the battery and runs the electrical system of the car. It typically takes about twenty miles of driving to restore the charge to the battery from starting the engine. Most alternators are internally regulated to assure proper output voltage . Older cars have alternators with external regulators There are some exceptions to this but this true in the majority of cases. One of the exceptions is a high current alternator for a Lincoln that delivers 120 volts AC for receptacles (the same as at home) in addition to the charging of the battery.


Jun 02, 2011 | 1999 Lincoln Town Car

1 Answer

Will not start, battery related, was needing to be jumped so changed battery, started fine for a month and same thing again, except today it will not even jump start

while the battery has been charged, check for a voltage of 12- 12.5 volts,, then start the vehicle,, you should get a reading of 13.75- 14.5 volts , which would show the alternator and voltage regulator of functioning properly if not,, charge the battery and replace the alternator

May 08, 2011 | Chevrolet Monte Carlo Cars & Trucks

2 Answers

My 1987 dodge w 150 wont hold a charge ive changed the alernator battery as well as the voltage regulator. when i charge the battery it holds a charge for about 5 to 6 starts

Could be a short. Have you checked the voltage at the battery with the car running? Is it over 14 volts?

Please see my tip at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Oct 19, 2010 | 1987 Dodge W150

2 Answers

I have a 85 mustang gt and the battery will over charge when i drive it .put in a new bat,voltage reg,alt,bat cables .need help!

You would think that the problem would be solved after changing all of those parts!

The voltage regulator should keep the voltage below a certain level. Even though you changed that, I would be suspicious about the quality of the part.

I would try another brand of voltage regulator.

Have the starting and charging system analyzed at Walmart or your local parts store to see what it charges at under load.

Good luck to you.

Jul 04, 2010 | 1985 Ford Mustang

1 Answer

Triumph tr6 shows excess charging even at idle. It started without problem after being in storage for the winter, but after one week of sitting the charge had run out and I put it on a trickle charge all...

could be one of two problems ,firstly the battery has a cell on the way out ,or the voltage regulator ,i would plump for the battery first by doing a heavy duty drop test and see if a cell gasses up .or put another battery on from another vehicle and see what happens ,if its still teh same renew the regulator

Apr 04, 2010 | Triumph Tr 7 Cars & Trucks

1 Answer

After changing alternator and voltage regulator. Still not charging. 2nd $15.00 regulator replacment

Check your battery and check the ground wire from battery. Make sure all your wires are clean and good connections. A bad battery will not charge and a dead battery will not charge a alternator maintains a battery not charge a battery, so charge your battery completely before checking that the alternator is working. Check all the wires going to the starter for good tight and clean connections . Hope this helps...

Nov 26, 2009 | 1987 Dodge Ramcharger

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