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Alternator Field coil das not have voltage.Alternator has 0,0 volt during engine operation.

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Replace alt.

Posted on Apr 27, 2010


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How do I test the alternator to determine if it's good?

Take the vehicle to a auto parts store , they check them for free .

Apr 21, 2017 | Cars & Trucks

1 Answer

2006 ford 3.9L has code P0625, but my alternator is charging just fine.

P0625 - Generator Field Terminal Circuit Low Description: The powertrain control module (PCM) monitors generator load from the generator/regulator in the form of frequency. The concern indicates the input is lower than the load should be in normal operation. The load input could be low when no generator output exists. Possible Causes:
  • GENRC circuit short to ground
  • GENLI circuit short to ground
  • Open B+ wire during operation
  • Low system voltage
  • Broken generator belt
  • Damaged generator/regulator assembly
Diagnostic Aids: Verify the battery voltage is 14.5 volts. Verify the generator/regulator has the correct part number. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test HY .

Dec 21, 2016 | Ford 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 !
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

It showing code 41. Generator field not switching properley.

This trouble code sets when the Powertrain Control Module (PCM) tries to regulate the generator field with no result during monitoring.
The PCM tries to maintain a system voltage between 12.9 volts and 15.0 volts. The voltage determined by the PCM as the final goal for the charging system is called "control" voltage. This control voltage is determined from the battery temperature sensor for ambient sensor and the sensed voltage system voltage at PCM pin #11.
The control voltage is compared to the sensed voltage continuously during running. If the sensed voltage is less than the control voltage, the PCM will supply more ground to the field circuit. If the sensed voltage is more than the control voltage, the PCM will supply less ground to the field circuit.
There are three possible causes for this, the field driver circuit open or shorted, there is an alternator internal open or short os a PCM failure

Jun 04, 2015 | Cars & Trucks

1 Answer

Codes forp155 and102

1. Check the voltage output of the MAF sensor by measuring voltage on the Light Blue/Red (LB/R) wire with a Digital Volt-Ohm Meter (DVOM). A typical idle reading will show 0.7-1.1 volts at idle and the voltage should respond quickly and rise to above 3.0 volts during a snap acceleration of the throttle.

2. If the MAF voltage is out of range and/or it does not react during the snap acceleration of the throttle, replace it.

3. Check the Brown/White (BR/WH) wire of the Throttle Position (TP) sensor for a steady reading of 4.9-5.1 volts. If the voltage is out of range, verify PCM power and grounds are good before replacing the PCM.

4. Unplug the voltage regulator at the alternator and recheck the engine running condition and values as previously noted through the scan tool. If the engine runs better with more realistic pulse width values and good fuel trim functions when the voltage regulator is disconnected, replace the alternator assembly.

5. Wet down the ignition wires and coil pack and look for possible signs of electrical arcing that may be spiking the PCM and engine control components with electrical noise.

6. Inspect all battery cable connections including the connection to the fuse box, engine, block and body grounds near the battery. Address as needed.

7. Check the vehicle's fuel supply for a quality issue which could influence the engine operation because of excess alcohol, the presence of diesel, or any other contaminant. Drain the tank and flush the system as needed.

Apr 14, 2014 | 1995 Ford Thunderbird

1 Answer

Computer Codes

IT means that the alternator is not producing enough current to maintain adequate battery voltage . The target voltage will be 14.5 volts to 15.5 volts and if there is nor voltage movement with changes to the RPM's then it is either the alternator failure or a slipping drive belt for the alternator . Have the belt condition checked and tensioned.

Mar 01, 2014 | 1997 Jeep Cherokee

1 Answer

I am getting P0622 on my Chrysler Town and Country. I have a brand new battery and the alternator tested good at Auto Zone. I got 12.4 volts at the battery with the van off and between 7 and 8 volts...

if you getting 12.4 volts with no power load and engine goes down to 7-8 volt should be between 13-14 volts on idle would say the voltage regulator has gone.some are replaceable but most are not so you will need a new alternator or a secondhand one that is know to be working.

Sep 15, 2013 | 2001 Chrysler Town & Country

1 Answer

1989 f350 7.3 replaced voltage regulator and alternator same time. still not charging

you should have 12.5 volts with engine off at battery and 14.4v with engine running and charging system working. Is alternator light on? please rate, thx.

There are different versions and 1989 is too old to get on line. here is 1993, so take with caution. Also check the fusible link.

Battery Positive Voltage (B+) Output
The generator (alternator) output is supplied through the Battery Positive Voltage (B+) output connection to the battery and electrical system. I Circuit
The I circuit, or ignition circuit is used to turn on the voltage regulator. This circuit is powered up with the ignition key in the RUN position. This circuit is also used to turn the indicator on if there is a fault in the charging system operation or associated wiring circuits A Circuit
The A circuit, or battery sense circuit, is used to sense the battery voltage. This voltage is used by the regulator to determine the output. This circuit is also used to supply power to the generator (alternator) field coil. This circuit is connected back to the load distribution point and is a protected circuit. S Circuit
The S circuit, or stator circuit, is used to feedback a voltage signal from the generator (alternator) to the regulator. This voltage, typically 1/2 battery voltage, is used by the regulator to turn off the indicator.


Oct 12, 2011 | 1989 Ford F 350

1 Answer

1986 Volvo 4cyl alternator question. How many wires are connected to the alternator ? I know one is the hot lead.

There should be a pair of wires going to it to supply the field coil voltage( this is the voltage applied to the field coils to produce the magnetic energy to generate the power in the stator assembly)...there shold be 12 volts going to these wires

Jan 25, 2011 | 1986 Volvo 740

1 Answer

Ive got a 1974 dodge pickup with a mid 80's? 315 engine. My alternator has a bat, field and grd terms. My wiring calls for 2 field terms? How do I marry them? The alternator is putting out big time and at...

you need to find the volt. reg. and the wires from the reg. go to the alt. the field doesn't get strait bat volt. but 13 or 14 volt isn't bad, but if your wires are rite than your reg. is bad. 18 volt is to high!!!

Jul 25, 2008 | Dodge D150 Cars & Trucks

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