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All circuits seem good but still won't charge battery

Have changed alternator and battery, checked and I get 12 volts, Key on, at the alt + connector, and get 5 volts, key on at the other alt connector

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  • Contributor
  • 7 Answers

Sometimes new batteries are still bad, it sounds like the battery wont take a charge, go get your new battery tested and go from there.

Posted on Jan 15, 2013

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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baccardo
  • 150 Answers

SOURCE: car won,t charge the battery the alt is good i had it checked

depending on the year model of your car the voltage regulator is intergrated in the pcm

Posted on Apr 23, 2009

  • 101 Answers

SOURCE: 97 FORD F350 SUPER DUTY ATERNATOR LIGHT ON NOT

The wires are probably broken internally, replace

Posted on Sep 10, 2009

  • 583 Answers

SOURCE: Will not charge

you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME

Posted on Oct 22, 2009

  • 14036 Answers

SOURCE: alternator not charging

ALTERNATOR DRIVE BELT SLIPPING OR BATTERY CABLES NEED REPLACING IF THEY ARE THE ORIGINAL ONES.THE VOLT GAUGE COULD BE FAULTY.TO TELL GET A DIGITAL VOLTMETER HOOK TO CAR BATTERY CRANK CAR UP.BATTERY VOLTAGE SHOULD BE 13.5 TO 14.5 VOLTS. WITH NEW CABLES. IF NOT CHECK ALTERNATOR FIELD WIRES FOR DAMAGE ALSO ALTERNATOR POSITIVE WIRE FOR DAMAGE.

Posted on May 30, 2010

japkid
  • 107 Answers

SOURCE: 1988 f150 4.9l straight 6

check your grounds sounds like it could be the culprit

Posted on Feb 08, 2011

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2 Answers

Put a new alternator and battery on the truck but still does not charge


Hi George,
I need year--make--model--engine size.
Usually the alternator needs excite voltage or no charge. The alternator bat terminal should be hot all the time, even with key off, if it isn't, something wrong with that wire circuit.

Mar 04, 2016 | Cars & Trucks

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Hooked up battery backwards on my 1992 ford explorer. Got it running now the alternator isn't charging the battery. Has 12 volts power. Could it be the points on alternator where the wiring hooks into...


The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first

Jul 26, 2013 | Cars & Trucks

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Car won't start after switching baterries


re move alt. have it re tested i had a signaler problem. tested fine at idle under load alt surged blow batt. also volt regulator may be constantly draining battery voltage regulator is inside alternator

Nov 23, 2012 | Oldsmobile Cutlass Ciera Cars & Trucks

2 Answers

2000 vw jetta alternator won't charge


the alternator gets power on big wire battery voltage the wire runs to starter, fuse box .alternator fuse goes to automatic shut down relay to relay control in ecm/pcm the field wire comes from ecm /pcm to alt.other field goes back to automatic shut down relay back to charge battery . if not charging at alt. try new alt. and retest.

Aug 05, 2012 | Cars & Trucks

2 Answers

99 mustang battery not charging


First off, disconnecting athe battery while the engine is running is the quickest way to damage an alternator. Unlike the old DC generators, the alternator needs the battery in circuit to protect it against voltage runaway.

If the alternator has been bench-tested and seems to be functional, I would start by verifying the related vehicle circuits. Witch a DC voltmeter, start out by measuring the voltage at the alternator's output terminal, the heavy black/orange wire. It should be full battery voltage. If it is anything less than battery voltage, you must determine why. Some things to look at are the gray 12-gauge fusible links A & B, and the various splices and connections in the circuit (see diagram below).

Next, disconnect the voltage regultor harness plug from the alternator and check the voltage at the wiring harness regulator plug's "A" terminal connector - the yellow/white wire. It too should be full battery voltage. If it is anything less than full battery voltage, you must determine why. In this case, look at the 20-amp ALT fuse in the battery junction box, and at the various splices and connectors in that circuit.

Then, turn the key switch to its "RUN" position and measure the voltage
at the wiring harness regulator plug's "I" terminal connector - the light green/red wire. It should be somewhere between 8 and 12 volts. If there is no voltage present, check Fuse 5 (15 amps) in the main fuse panel and the various connections in that circuit.

The final test is to measure the voltage between the batterty positive terminal and the alternator housing or frame. If it is anything less than full battery voltage, check the alternator mounting.


7_19_2012_12_45_20_pm.jpg

Jul 19, 2012 | 2000 Ford Mustang

1 Answer

Alternator put in and the car won't start and dead new battery'


I am taking it you have a new battery. You put on a alternator. Now you need to charge the battery until it is fully charged. That way the car will run for a while before it stalls from undervoltage. With the battery charged check the voltage at the battery. It should be 12 to 13 volts. Now start the car and check the voltage it should be up to almost 14 volts. If that is good check with lights and heater blower on should be at least 13.5 volts. If the voltage does not increase you either have a bad alternator or it is not getting excited by the ignition switch on the vehicle. So you should find the wire that energizes the alternator and turn the key on it should have 12 volts on it. Hope all this helps. please rate my answer so I get points.

Jan 12, 2012 | 1995 Jeep Cherokee

2 Answers

Why won't my car start without getting a jump? Once I get it jumped it runs really good but when I turn it off and try to start it again, it won't start. I have a new battery and a new alternator...


Buy yourself a volt meter and check the batter voltage before and after it starts. You should read 12 volts before starting and around 14 volts once it starts and the alternator is charging the battery. Also check for loose connections between the alternator and battery. Check that the ground wire from the battery is secured to the vehicles frame. Good luck!

Oct 18, 2011 | 1987 Audi 5000 CS

1 Answer

Battery not charging, alternator seem to putting


11.50 volts won't be enough potential to overcome the batteries 12 volt standing charge.

Either your alternator is shot...which you can check by going to an Autozone and having a free system check. Or your battery is already going bad and not sending enough voltage to the alternator to make the 13.8-15.8 volts it should be making.

If the alternator is the culprit a good mechanic will swap it out for a fairly low price and save you a lot of headaches.

Good luck and be careful.

Jan 14, 2010 | 2002 Volvo S60

1 Answer

Code 43 . my alt stayes at about 11 12 volts when


CODE 43 IS ELECTRONIC SPARK CONTROL -.KNOCK SENSOR.LOOKS LIKE ALTERNATOR NOT PUTTING OUT ENOUGH VOLTS TO CHARGE BATTERY.YOU NEED 13.5 TO 14.5 VOLTS.CHECK ALTERNATOR FUSE AND ELECTRICAL WIRES.MAKE SURE BELTS NOT SLIPPING.IF ALL IS GOOD.REMOVE ALTERNATOR.LET AUTO ZONE CHECK IT.TO MAKE SURE.TURN OFF RADIO BEFORE MOVING BATTERY CABLES.SO YOU WONT LOSE RADIO CODE.YOUR CAR IS NOT GOING TO RUN RIGHT IF THE ECM DONT RECEIVE 12 VOLTS OR 13 VOLTS.

Sep 24, 2009 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Alternator test said good, put on car & not charging ,battery test good amp meter decrease`s


Remove and clean battery cables , replace bolts. Check for power going to the alt. it will not charge unless is has power in the connector wire. When alt is tested get them to tell you how many amps it is putting out, not volts. 12 volts will not charge a battery unless you have the correct amount of amps. I had a napa alt and had this trouble twice. The guy said it was good it had over 12 volts output, but it would not charge battery. I fixed mine with a better quality alt. from another store.

Jul 18, 2009 | 1991 Buick Park Avenue

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