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Don't believe car is charging. Have to charge battery every 3 days. Meter reads 13.9 engine running after charge air and headlights on. Is Altenator Fused? 1998 FWD V-8 Where would fuse be?

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  • RONALD_CADY_ Oct 07, 2008




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One easy way to see if the alternator is charging is to take a screwdriver, and hold it close to the center of the back of the alternator, where the shaft would be located inside, the alternator should work a s magnet, and draw the screwdriver to it, if not your alternator is not charging.

Posted on Oct 03, 2008


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3 Answers

" HI " Where is the Voltage Regulator Located on a 2002 Dodge Stratus R/T 3.0

The way to check for an over or under charge is to connect your volt meter to the battery, before starting the vehicle.
You should have a reading of 12.5 to 13 volts. If it's 11.8 like you stated or less, it means battery is not fully charged, or it's bad. Now start the car & check voltage again while running the engine, the voltage should exceed 14+ volts, this means your Alternator is charging, the voltage should drop after battery has been charging for awhile. When you turn the engine off after letting it charge the battery, & if the battery is good, you should now have 12.5 volts to 13 volts.
Now to answer your question, the Voltage Regulator is inside of the Altenator, I believe you xcan take the alternator apart to replace it, or simpler to just replace the complete alternator.

Nov 15, 2014 | 2002 Dodge Stratus

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Battery light comes on and off and computer says service charging system and battery not charging sometimes when I first start the engine its fine but after awhile battery light comes on and battery not...

what you need to do is check the altenator for voltage it should be between 13 and 15 volts this is easily done with a standard volt meter check it at the altenator witch is located right on top of the engine on the back of the altenator there is a thick red wire that is where you want to put the positive and just put the black wire of the volt meter on the case of the altenator and check the reading it sounds like the altenator is bad there is also a fuse you should check your owners manual for location of the fuse also have your battary checked this should help ant questions just ask me

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2012 chevy cruze no charge

Disconnect battery while car is running. If car dies altenator is bad. With car not running check battery with volt meter. Should read 12 to 12.46 without engine running. Start car and check battery with volt meter, should read 13 to 13.50. If less than 12 with engine running then altenator is no good.

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The battery and altenator are both new and tested good but the battery will not charge all wires are hooked up and seem to be in good condition

Hello! If you have a voltmeter, set it to read 12 volts...With engine off read across the battery terminals...Record the reading...Start the engine...Take the same reading...Voltage must be at least 1.8 volts higher...If not, The alternator isn't providing a charge...Next, turn off engine...Set meter to its lowest scale...Connect + probe to + battery post...Connect - probe to the + (Black/Gray or Black wire) battery lead on the alternator...Start the engine...Turn on heater fan and headlights...Meter must read less then .03 volts...Move the + meter probe to the - battery post...The - probe to bare metal on the engine block...Must read less then .06 volts...If either reading is above the given limits the problem is resistive/corroded battery cables which are dropping voltage...Remove and replace cables... Clean battery post and make sure the other ends are on bare metal...Guru...Saailer

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Im fixing a 2001 pt crusier ive changed altanater the belt surpintine belt and the computer and its still not charging the battery ive had the altanater tested its good its just not getting charge so i...

check the battery. it may not be holding a charge!! at battery with car off it should read at least 13 volts, with it running at battery it should read 14 or a bit higher. have a good day!! check the engine and battery grounds also.

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My car works fine but some how my battery keeps going so low i can barley start it, i can not play with the radio or windows when the engian is off but car is on, some days i just cant start it caus...

is the alternator charging??if you have a battery charge light ..put ignition in start position..battery light should come on..if it dosnt the volatage regulator is shorted..if it does come on start should go off once engine has started.. buy a cheap dc voltage shack 6.00 ..start engine,, get your voltage meter put red lead on battery positive black on neg.while engine is idleing it should read 13 to 14 volts..if you have a charge gauge on your dash check to see what your reading is..put headlights on at idle if it goes below 12 volts..its not charging..unless you have a short..then battery will lose charge overnight or after a few hours depending on short..that should cover most of it..happing hunting

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1 Answer

Elec shorttruck

Have a volt meter? If so start the engine if you can get it charged uo and set the volt meter to 200
Them make sure the volt meter is set to the AC mode. I know it supposed to be set to the DC mode although we are doing a test, correct? Now with the meter set to the DC mode and the engine running, take the positive probe which is the RED one and place that on the NEGATIVE post of the battery. Now put the BLACK Probe one the POSITIVE side of the battery. If a reading of voltage shows of any sort the diode in the altenator is at fault. That problem causes the system not to charge the battery. Generally a diode will got out upon jumping another vehicle. You stated you bought an altenator new. If so new ones cost hundreds of dollars. If a lot lees you had purchased a rebuilt. Rebuilder do screw up so you may have a bad on here so running this test may find your problem very easy. If the voltage reading reads OL the altenator diode is good.

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2 Answers

Alternor not charging the battery

check the altenator with an VOLT/OHM METER
If you do not have one any auto parts store like Auto Zone sells these at a cheap price. Now that the red and black probes and place them on the battery, red ond positive Black on Negative. the meter has to be set on the DC mode. Make very sure of this so the meter doesn't not short out. With the engine running you should get a reading if 13.5r volts if the altenator is working. Now to check the diode on the working altenator. Reverse the probes while the egine is still running. If the same reading is shown the diode is bad letting the current reverse itself causing a no charge to the battery. Diodes are for letting the current to run one way which is called Direct Current. If the current is going both ways while the engine is running the battery never receives a charge.
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1 Answer

1988 toyota corolla wont hold a charge new battery and alternator

take a volt meter and have it set to the dc mode
probe the meter red on positive and black on negative to the battery with the engine running.
you should get a reading of 13.5 volts.
if not the altenator is bad
next you can do this test which is easy to do.
sway the two probes around, red on black and black to red
if a reading shows up the diode in the altenator is bad as well
the diode is to keep the currebt going one way to charge the battery
if flow in reverse no charge will be made to the battery

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2 Answers

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If all the wiring is OK - have the alternator output checked. A voltmeter connected across the battery terminals should read above 13.5 volts with the engine running. If not - the alternator may need to be replaced.

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