Question about Fiat 124

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I have a 1971 Fiat 500. The battery keeps running down. I have replaced the generator, battery and Generator Regulator and still have the problem. Can't find a Fiat mechanic in Hawaii. Please help. John

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I know very well the electrical system of your machine, I can help even after tell that you can do, without special tools. you have the problem solved? If you friends as before or try the solution.

electrik

Posted on Feb 14, 2009

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2007 saturn vue hybrid system not charging 2.4


Did you test the electrical circuit's ? Have a scan tool hooked up ? Did you have a qualified repair shop check it out ?
When the engine is running, the generator control signal is sent to the generator from the engine control module (ECM)/powertrain control module (PCM), turning on the regulator. The generator's voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine is started, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. When the voltage regulator detects a charging system problem, it grounds this circuit to signal the PCM that a problem exists. The PCM monitors the generator field duty cycle signal circuit. The system voltage sense circuit receives B+ voltage that is Hot At All Times through the ECM/TCM fuse in the underhood junction block. This voltage is used by the regulator as the reference for system voltage control.
This vehicle uses Class II and controller area network (CAN) communications. The ECM/PCM are CAN and the body controller systems are Class II. The body control module (BCM) acts as the gateway between the different communication protocols. The ECM/PCM requests the battery lamp on the CAN communication line and then the BCM sends a request to the IPC for lamp illumination.
The ECM/PCM will request the battery lamp on under the following conditions:
• The ECM/PCM interprets the ignition is in the accessory position.
• The ECM/PCM is in the RUN power mode with the engine not running.
• Generator L terminal fault has been detected.
• Generator F terminal fault has been detected.
If the generator is not charging, it pulls the F terminal low causing an F terminal fault. Low voltage threshold is 10.5 volts for 4 minutes and engine at least 1,300 RPM. High threshold is 18 volts for 5 minutes.


https://www.motor.com/magazinepdfs/042010_09.pdf

Do you know what DTC'S diagnostic trouble codes are ?
DTC B1325
DTC B1327
DTC B1328
DTC P0562
DTC P0563
DTC P0615
DTC P0621
DTC P0622
These are all for the charging system .

Oct 19, 2017 | Saturn Cars & Trucks

2 Answers

EZGO TXT, what is the voltage I should see at the battery while engine running under load?


Around 15 + or - a little. This indicates the alternator is charging.

Oct 18, 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 !
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

I have a 2002 yukon xlt, today the battery light started coming on intermitantly and the battery started losing voltage, I pulled the alternator and had it tested at 2 different auto parts stores , both...


Is there B+ voltage on the heavy gage wire on the back of the alternator ? Possible blown fusible link. Plus the two wires in the connector go to the PCM - engine computer . One is the turn on signal ,the other is charge indicator control . Having the vehicle checked for DTC'S - diagnostic trouble codes should also be done .DTC P1637
The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 10 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM. Under certain operating conditions, the PCM can turn Off the generator by turning Off the 10 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
Your best bet mite be to take it to a qualified repair shop.

Dec 28, 2017 | 2002 GMC Yukon XL

2 Answers

I have a 1990 f150 lariat my alternator wont keep my truck running I replaced the alternator today along with alternator harness. I got the alternator tested and its good, the battery is good, and soliniod...


https://s11.postimg.org/crrcun103/generator.jpg

Click on the link.
The diagram shows generator with internal voltage regulator and with external voltage regulator, at the moment, I don't know which one you have?
The bat terminal at the generator should be hot even with the key off, is it, use a test light. If no voltage either the fusible link is faulty or the wiring circuit to battery +. You can see fusible links in diagram.
Could be other issues, the generator probably needs excite voltage or it won't work. The excite voltage comes from charge indicator circuit. Does the charge lamp on the dash work?

Jun 29, 2017 | 1990 Ford F150

1 Answer

New batteries and alt. still no charge.


Generator with Integral Rear Mount Voltage Regulator, Internal Fan Type With the key in the RUN position, voltage is applied through the charge indicator lamp I circuit to the voltage regulator. This turns the voltage regulator on, allowing current to flow from the battery sense A circuit to the generator field coil. When the engine (6007) is started, the generator (GEN) (10346) begins to generate alternating (AC) current which is converted to direct (DC) current by the rectifier internal to the generator. This current is then supplied to the vehicle's electrical system through the battery positive voltage (B+) terminal located on the rear of the generator. Once the generator begins generating current, a voltage signal is taken from the stator and fed back to the voltage regulator S circuit, turning off the charge indicator/lamp. With the system functioning normally, the generator output current is determined by the voltage at the A circuit. This voltage is compared to a set voltage internal to the voltage regulator, and the voltage regulator controls the generator field current to maintain proper generator output. The set voltage will vary with temperature and is typically higher in the winter than in the summer, allowing for better battery recharge. With the system functioning normally, the generator output current is determined by the voltage of the A circuit (battery sense voltage). The A circuit voltage is compared to a set voltage internal to the voltage regulator, which controls the generator field current to maintain proper output. The set voltage will vary with temperature and is typically higher in the winter than in the summer, allowing for better battery recharge in the winter and reducing the chance of overcharging the battery in the summer. A fuse link is included in the charging system wiring on all vehicles. The fuse link is used to prevent damage to the wiring harness and generator if the wiring harness should become grounded, or if a booster battery with the wrong polarity is connected to the charging system. Mitsubishi 215-Ampere Generator
The Mitsubishi 215-ampere generator is an internally regulated, brushless unit that is self-current limiting and temperature compensating. The regulator is integral with the generator and the fan is external.

VISUAL INSPECTION CHART Mechanical Electrical
  • Before attempting to test a battery, it is important to give it a thorough examination to determine if it has been damaged.
  • Batteries are tested to determine the state of charge and ability to crank an engine. The result of these tests is to show that the battery is either good, needs recharging, or must be replaced.
  • Preliminary checks to the charging system should be made regardless of the fault condition. These checks include:
    • Check the fuses/fuse links to the generator to ensure that they are not burned or damaged. This condition, resulting in an open circuit or high resistance, can cause erratic or intermittent charging system concerns.
    • Check battery posts and cable terminals for clean and tight connections. Clean the posts and the cables to ensure good electrical contact.
    • Check for secure connections at the generator output, voltage regulator and engine ground. Also check the connection at the power distribution point.
    • Check the generator drive belt to ensure proper tension and no slip between the generator pulley and the drive belt. Refer to Section 03-05 in the Powertrain, Drivetrain Manual.
    • Check battery for full charge.
  • Before performing charging system tests on the vehicle, note conditions such as: slow cranking, discharged battery, charge indicator lamp stays on with engine running, charge indicator lamp does not illuminate with ignition switch in RUN and engine not running, etc. This information will aid in isolating the part of the system causing the symptom.
  • When a relatively new battery is discharged, test for current drain. The following are some of the most common current drain concerns:
    • Glove compartment lamp stays on with the door closed.
    • Engine compartment lamp stays on constantly.
    • License plate lamp or interior lamp stays on constantly.
    • Other electronic component concerns.

Aug 14, 2009 | 2005 Ford F 350 Super Duty

1 Answer

I need a printable diagram for replacing an altenater on a 1994 ford mini-van. Does anyone know a website to find one for free?


Removal
  1. Disconnect battery ground cable (14301) .
  1. Remove snow/ice shield.
  1. Remove engine air cleaner intake tube (9A624) .
  1. Disconnect the generator voltage regulator wiring (14305) to the voltage regulator.
  1. Remove wiring connector bracket.
  1. Loosen the drive belt tensioner (6B209) and remove the drive belt .
  1. Remove the bolts holding the voltage regulator to the generator bracket (10A313) .
  1. Remove the voltage regulator from the generator bracket .
Installation
  1. Position the voltage regulator on the generator bracket .
  1. Install the bolts and tighten to 40-55 Nm (30-40 ft-lb).
  1. Install the drive belt over the generator pulley .
  1. Adjust the drive belt tensioner as outlined in Section 03-05 .
  1. Connect generator voltage regulator wiring to the voltage regulator. Tighten generator Battery Positive Voltage (B+) wire attaching nut to 9-12 Nm (6.5-9 ft-lb).
  1. Install wiring connector bracket.
  1. Install engine air cleaner intake tube .
  1. Install snow/ice shield. NOTE: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) (12A650) relearns its adaptive strategy. The vehicle may need to be driven 10 miles or more for powertrain control module to relearn the strategy.
  1. Connect battery ground cable .

Jul 28, 2009 | Ford Aerostar Cars & Trucks

1 Answer

1971 Volkswagen Beetle. Blowing fuses


You have a wire shorted to the body of the car, the easiest way to fix this is to run a new wire, if the short persists the generator may be shorted. be sure to use the correct size wire for the new lead.

Aug 08, 2008 | 1998 Volkswagen Beetle

1 Answer

1970 VW Beetle voltage regulator


loud your battery again and see if ti keep running it down--if yes check the battery loading size it suppose to be around 12-13.
less then 9-10 in most cases it's the alternator cause another thing is your battery could be out of work

Jul 01, 2008 | Volkswagen Beetle Cars & Trucks

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