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My battery and alternator are good, but still have low voltage

Told battery and alternator are good. but battery has low voltage,? what else can I check

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Posted on Jan 02, 2017

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SOURCE: Battery doesn't charge. I have checked the cables

The battery on a Dodge Caravan is subject to the same drainage issues every conventional automobile battery has. If the alternator does not produce enough current to recharge the battery, it will lose its charge over time. If the voltage regulator is not functioning properly it can impair the ability of the battery to stay charged. If the operator leaves the headlights on, or the door open or any number of other accessories that draw electricity from the battery while the engine is not running, the battery will eventually die. Loose battery cables can also keep the alternator from supplying current back to the battery
the votage regalator usally is first to go out. thanks

Posted on Oct 27, 2010

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SOURCE: voltage light comes on after the van warms up.

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2001 f250 changed battery changed alternator stupid thing stiil will not charge battery

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I have a 1998 Hyundai accent that wont hold a charge I bought a new battery. alternator,and recently a starter but still doesn't charge even driving 20+ miles took it to schwabbys and they told me the...

Check the thick red wire from the alternator to the battery to make sure it is solid and the fusible link isn't blown or open. If you fail to disconnect the battery before changing the alternator you can short the wire blowing the fusible link.

If that is good, check the alternator voltage (same red wire) while the engine is running and it should be somewhere between 13.7 and 14.5 volts (depending on design) which should also appear on the battery terminals. Also check the field terminal of the alternator which should vary with the number of electrical items you have turned on in the car. The field should be between (I believe) 8 and maybe 11 or 12 volts. If it is very low or no voltage the engine control module or wiring is faulty or the ECM is not able to see the battery voltage either because of a wiring or alternator fuse issue.

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1998 Ford Explorer Low Battery/Voltage Reading

Bad alternator you should have about 14.7 volts at idle with a new alternator.

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2002 chevy cavalier battery shows 12.30 volts at rest. Once the car is started the voltage drops to between 10 and 9 volts. The voltage differential between bolt on the rear of the alternator and the...

Verify that BOTH your positive battery cable AND your negative battery cable have good clean connections at both ends. Make sure that the part where the negative battery cable bolts too on the body of the car is free of rust and a good solid connection. After confirming good connections, then verify that the alternator is charging at between 13.5 and 14 volts when the engine rpm is raised to near 2000 rpm. Check that the battery voltage stays above 10 volts when the starter is cranking and turning the engine over. Once all these things are met, then the system is in good condition. If the battery voltage is too low after a sufficient amount of recharge time, then the battery is probably bad. If the Alternator voltage is too low once you verify a good battery, then the alternator is probably bad.

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I had my starter replaced in May, then my battery in June now I have had 2 new batteries in a week, I turn it over and it clicks still has power to headlights and interior both times. I was told my...

voltage at battery, car off. shoud be at least 12.6 volts. when running if all belts are ok it should read at least 14.2 to 14.7 if alternator and curcuit are ok. if voltage is less than above replace alternator. because it has the voltage regulator on inside of alt. good-day!

Jul 16, 2011 | 1999 Dodge Caravan

1 Answer

My car wont turn over i was told it was the alternator, i just replaced the battery 2 months ago but now it wont start again. is there a fuse for the alternator

The alternator is never the reason for a car not turning over, unless the battery is low. If the car will jump start, remove the cables and check the voltage at the battery while the car is still running. If the voltage is less than 14 volts, take the alternator off and have it tested at the parts store. If the voltage is good, the alternator is fine, and it should be charging the battery.
If the car will not jump start, your problem is elsewhere.

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.

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Voltage guage showing low reading. Had alternator tested. They said it was bad. Replaced it. Only getting 13. something with engine running. 12. something with out running. A "guy" told me the new...

You can isolate the new alternator by starting the car and disconnecting the negative battery cable with engine running. Now measure the voltage at the positive terminal to a ground. This will be your alternator voltage under normal load (w/o battery). It should be 14-15 VDC and closer to 15 if it's new. If not, return the new alternator and try again. If the voltage is normal, try touching the negative cable back to the battery terminal and see if it takes it back to 13. If yes, maybe your battery has an internal short.

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My 1994 Jeep Cherokee Country - 6 cyl 4WD is clicking and not turning over. My battery is a few years old and I replaced the starter 2 years ago. I have been told that it may be the solenoid.....any...

First, do not assume anything. Check the battery with a volt meter and make sure there is 12.v or better there. Clean cable terminals where they contact the battery, check both ends of cables for good clean solid connection. Since you hear a click, that is good ...ignition switch etc is likely good. Check the voltage at the starter : large cable should have 12v, small wire should have 12v when key is turned to "start" position. If you have both, starter has failed. Some Jeeps have an additional starter relay inside the power distribution center near the battery. if you have voltage at the starter, the relay is good. If when you test battery, voltage is low, have it charged and load tested. If battery fails test, no other tests are valid.
Once started, check for running voltage of at least 12.9v with all accessories and lights on. At no time should voltage drop below 12.5, or should it continue to creep down. If it does, the alternator may be faulty.(providing belt is good and tight)

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Causes of low battery voltage and solution

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.

Apr 18, 2009 | 2002 Volvo S60

1 Answer

Voltage regulator

Voltage regulator is built-in to the alternator assembly.

Have you tried replacing the battery?
A battery with a shorted cell will not charge properly and may even damage an alternator or regulator.

Note1: use a digital voltmeter (about $25 at Lowe's or Radio Shack) and check voltage across batt terminals while engine running. If more than 12.6 Volts DC and more typically about 13 Volts, then the alternator is working.

Note2: from Jan 98 to May 98 shows a different part # alternator than June - Dec 98
check the manufacture date on your driver door edge.

Oct 25, 2008 | 1998 Mazda Protege

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