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Charging gage reads 12 volts. when you drive for 10 minutes the gage drops to the 9 volt position and all the warning lights on the instrument panel light up.

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Check your altinator and see if it is putting out at least 16v

Posted on Sep 13, 2010

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1 Answer

Charging problems


Alternator , brushes or the regulator are going bad !

Sep 06, 2016 | Cars & Trucks

1 Answer

What is causing the battery to drain?


Running the car will drain the battery it if it's not charging ! An if your charging light is on it isn't charging ! Did you check power an grounds on the alternator ? There is a single heavier wire on the back of the alternator, this should have battery voltage ! You may want to take this to a ASE certified repair shop !
Functionality
With the ignition switch in the RUN position, voltage is applied through the warning indicator I circuit 904 (LG/RD) to the voltage regulator. This turns the regulator on, allowing current to flow from battery sense A circuit 35 (OG/LB) to the generator field coil. When the engine is started, the generator begins to generate alternating current (AC) which is internally converted to direct current (DC). This current is then supplied to the vehicle's electrical system through the output (B+) terminal of the generator.
Once the generator begins generating current, a voltage signal is taken from the generator stator and fed back to the regulator S circuit 4 (WH/BK). This voltage feedback signal (typically half the battery voltage) is used to turn off the warning indicator.
With the system functioning normally, the generator output current is determined by the voltage of the A circuit 35 (OG/LB). The A circuit 35 (OG/LB) voltage is compared to a set voltage internal to the regulator, and the regulator controls the generator field current to maintain the correct generator output.
The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures. This allows for better battery recharge in the winter and reduces the chance of overcharging in the summer.
Battery Positive Output (B+) Circuit 38 (BK/OG)
The generator output is supplied through the battery positive output (B+) terminal on the back of the generator to the battery and electrical system.
I Circuit 904 (LG/RD)
The I (ignition) circuit 904 (LG/RD) is used to turn on the voltage regulator. This circuit is powered up with the ignition switch in the RUN position. This circuit is also used to turn the charging system warning indicator on if there is a fault in the charging system operation.
A Circuit 35 (OG/LB)
The A (battery sense) circuit 35 (OG/LB) is used to sense battery voltage. This voltage is used by the regulator to determine generator output. This circuit is used to supply current to the generator field (rotor). The amount of current supplied to the rotor will determine generator output.
S Circuit 4 (WH/BK)
The S (stator) circuit 4 (WH/BK) is used to feed back a voltage signal from the generator to the regulator. This voltage is used by the regulator to turn off the charging system warning indicator. The S circuit is fed back externally on external mounted regulator generators.
Visual Inspection Chart Mechanical Electrical
  • Battery case, posts, hold-down clamp, cables and connections
  • Generator drive (serpentine) belt for condition and tension to make sure there is no slip between the belt and the pulley. For additional information, refer to Section 303-05 .
  • Battery charge
  • Generator pulley
  • Battery junction box (BJB)Mega Fuse
  • Battery junction box fuse:
    • 11 (20A)
  • Central junction box (CJB) fuse:
    • 30 (30A)
  • Circuitry
  • Charging system warning indicator
  • Cables
  1. Check the operation of the charging system warning indicator lamp (instrument cluster). Normal operation is as follows:
    • With the ignition switch OFF, the charging system warning indicator should be OFF.
    • With the ignition switch in RUN and the engine off, the charging system warning indicator light should be on.
    • With the engine running, the charging system warning indicator light should be off.
  1. Verify the battery condition. Refer to Section 414-01 .
Normal Charging System Voltages and Charging System Warning Indicator Operation Ignition Switch Position A Circuit 35 (OG/LB) S Circuit 4 (WH/BK) I Circuit 904 (LG/RD) Generator B+ Circuit 38 (BK/OG) Battery Engine to Battery Ground Charging System Warning Indicator Operation OFF 12 volts 0 volts 0 volts 12 volts 12 volts 0 volts Off RUN-engine off 12 volts 0 volts 1-3 volts 12 volts 12 volts 0 volts Illuminated RUN-engine running 13-
15 volts 1/2 battery voltage 13-
15 volts 13-
15 volts 13-
15 volts 0 volts Off
  1. If the customer concern is verified after the initial inspection, refer to the Symptom Chart to determine which tests to carry out.
    • The charging system warning indicator is on with the engine running (the system voltage does not increase)
    • Circuitry.
    • Voltage regulator.
    • Generator.
    • GO to Pinpoint Test B .
    Your whole problem is the alternator is not charging , a couple tests with a volt meter would tell you !

Aug 16, 2015 | 2001 Ford Expedition

1 Answer

Alternator Test? My main fuse blew out and my alternator does not seem top charge. I did a load test and the battery is not charging. Before I spend the shop money, how would I check the alternator to...


Check the voltage of the battery with nothing on, it should read 12 volts.
Start the engine and check it again with a few revs. It should read 14 volts.
If it does not then it is not charging. If it does and the battery stays flat, then you have a problem with the battery.

Aug 29, 2011 | 1996 Chevrolet Lumina Mini

1 Answer

My 06 ford expedition won't turnover. the battery appears fine. it initially had a hard time turning over in the cold, but now it won't turnover at all. it'll start if someone gives me a jump, but after a...


If you have a Battery charger, disconnect the Neg cable of the battery from the SUV and charge the battery overnight. When you get the SUV running, take it to Autozone or Oreillys for a free scan. Also ask them to do a Starter draw test and to analyze your charging system and Battery.

The Ford antitheft systems are really sensitive to low power. While your vehicle has a 12 Volt system, a fully charged battery will have 13.2 to 13.4 Volts in it. A drop of 10% in battery performance will drop the charge to 12 Volts or less. This is enough to make the anti-theft lock out the Starter.

I have seen Charging systems automatically turn off once a jumper cable is removed. You can see it on the dash gauges where the Alternator is working and remove the jumper and after several minutes a perfectly good Alternator stops working while you are driving. Then install a battery with a 13.2 Volt charge and everything starts working perfectly from then on.

I mention this because you may have felt the Battery was charging after the jump and really it was not. You have to watch the Volt meter in your dash while you drive, there will be no warning lights.

I hope I have been helpful with my solution and that you will get a scan on your SUV.

Jan 01, 2011 | 2006 Ford Expedition

1 Answer

Alternator not charging the gage saying not charging but charging 9 volts had alternator tested its charging 14-15 voltes its got a new battery not charging good enough


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.

May 30, 2010 | 1994 GMC Safari

1 Answer

305 engine --The volts gage is dropping-- HELP


The gauge could be wrong,it could be defective,have the alternator checked,at the battery,it should read from 13.65 volts to 14.25 volts with the head lights on,and the ac blower on high,with the engine running.If the alternator is new,check for 12 volts at the back of the alternator with engine off,if there is not 12 volts on the large wire,on the alternator,then the circuit is broken somewhere.Just install a new wire,of equal or larger size.Leave the original wire on the alternator,and just add a new wire,larger would be better if possible,and run it from the alternator,to the positive side of the battery,it will fix the problem.

Mar 23, 2010 | 1983 Chevrolet Monte Carlo

2 Answers

When I start my 2009 Chevy Silverado it shows 15 1/2 volts. Within a few minutes it goes to 12 1/2 volts. Is this normal?


This is normal, My '04 GMC, goes to around 16 at first start-up then drops to 131/2 after it runs a while.

Oct 31, 2009 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Voltmeter drops to 9 volts on Chev 454 P30 motorhome


this is eithere a loose positive cable from the altenator to the battery or the regulator in the altenator is about to fail. if you have not had any problems starting the vehicle then most likely its a loose connection between the gauge and the charginging circuit or the gauge is faulty. take a multimeter and test the charging votage at the altenator while the vehicle is running it should measure 13.5 volts and should not change more than .5 volts. if the voltage drops more than 1 volt the regulater is bad and the altenator needs to be replaced. if it is working fine then looke for a bad connection make sure all positive and ground cables are tight. if they are replace amp gauge

Apr 19, 2009 | 1994 Chevrolet C/K 3500

1 Answer

2000 Ford Ranger


TEST B: BATTERY VOLTAGE OUT OF RANGE - DTC B1676
1. Check if vehicle has been jump started within past 2 weeks. If vehicle has been jump started, ABS is
okay. If vehicle has not been jump started, go to next step.
2. Using DVOM, measure voltage between positive and negative battery terminals. If voltage is 9-19 volts,
go to next step. If voltage is not 9-19 volts, diagnose charging system. See appropriate GENERATORS
article in STARTING & CHARGING SYSTEMS.
3. Turn ignition off. Disconnect 25-pin ABS control module. Install EEC-IV 60-pin Breakout Box (014-
00322). Turn ignition on. Measure voltage between breakout box terminal No. 20 and ground. If voltage
is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Light Blue/Pink wire between
ABS control module and instrument panel fuse panel.
4. Turn ignition off. Measure voltage between breakout box terminal No. 25 and ground. If voltage is
greater than 10 volts, go to next step. If voltage is less than 10 volts, repair Red wire between ABS
control module and power distribution box/engine compartment fuse box.
5. Measure voltage between breakout box terminal No. 9 and ground. If voltage is greater than 10 volts, go
to next step. If voltage is less than 10 volts, repair Yellow/Light Green wire between ABS control module
and power distribution box/engine compartment fuse box.
6. Measure resistance between breakout box terminal No. 8 and ground. Also, measure resistance between
breakout box terminal No. 24 and ground. If both resistance measurements are less than 5 ohms, replace
ABS control module and repeat self-test. If either resistance measurement is greater than 5 ohms, repair
suspect Black wire between ABS control module and ground distribution.
NOTE: DTC B1676 will set if vehicle has been jump started.
2000 Ford Ranger
2000-01 BRAKES Anti-Lock - 4WAL - Explorer, Ranger & Mountaineer

Jun 11, 2008 | 2000 Ford Ranger SuperCab

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