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Voltmeter engine start but electricity is not produced

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  • parlapanov Jul 10, 2010

    Does any voltage appear on generator terminals? (Can you measure it?)



    Is there a switch between the terminals and output plugs? Is it closed?
    What about the generators field DC voltage?

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  • 97 Answers

If the gen head has brushes check the brushes as well clean the rung that they press against with a very fine emery cloth if this doesn't not fix you may need to replace the rectifier it is a small unit black 1x1x3/8 inch with 4 wire posts will be located in the back of the gen head there ready avail and cheep about 5 bucks and can get from radio shack the numbers can cross reference easy some times there is 2 of there change them bolth they pop easy with a hard surge is still no power in the control box ther should me a regulator the sign for this to be bad is when you have strange power coming out like 38volts and 45 from the sockets then the regulator should be looked in to when you get the rectifier grab a spare ther easy to inttall and thers a small hole in the center for mounting check wires for arking to the armature if thease parts replaced and still no power 90% on the time this will fix if not the ger head is most likley bad shorted hope this helps

Posted on Aug 31, 2010

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After I start the engine it runs fine until it warms up to operating temperature and then runs rough and produces black smoke until t dies. It will not re-start normally until it has cooled.


Bad coolant temp sensor making ECU think engine is still cold, thus running rich, as if choke is on. There are two temp sensors, one for dash gauge (one wire) and one for the ECU (two wires). You can remove it and test with voltmeter by placing unit in hot or cold water to compare readings.

Jan 14, 2015 | Cars & Trucks

1 Answer

My battery is getting drained and my truck will cut off but will start back up after a min its a 87 d-150 with a 318


Check the charging system. When running, the alternator supplies all current to run the electrical systems and to recharge the battery for its next use in starting the engine.

Put a voltmeter on the battery. With the engine off, the battery should show 12.6 volts at least, to know the battery is good and is charged up. Then with the engine running, check voltage again at the battery. If your alternator is working, the voltmeter should now show at least 13.5 volts. If less than that, the alternator may be too weak to keep the engine running.

Oct 25, 2014 | Cars & Trucks

1 Answer

What or how does the battery get its charge


Most bike have an alternator driven off the left-hand crankshaft shaft.
This turns with the engine, producing the AC charging power.
This power then runs through a voltage regulator, that both converts the the AC voltage into DC voltage, and regulates the amount of voltage flowing into the remaining electrical system.

Now, you did do the first step correctly.
DC volt meter to battery terminals to see if you get 13-14 volts DC with engine running.
Next, locate voltage regulator and unplug connector for wires coming FROM the regulator, and hook up the DC voltmeter.
With engine running, you should have 13-14 (or so) DC volts.

If not, locate and unplug wires coming from alternator to regulator, and hook up AC (note change from DC to AC) voltmeter.
With engine running, should have AC voltage (this could be 20-40 volts or more).

This will let you know where the problem is, and what needs to be replaced.

Apr 25, 2014 | 1993 kawasaki KLE 500

1 Answer

Hey guys need a hand. I have a 2000gc. Brought it home with no issues. Git busy at work and it sat for a couple months. Now when I turn the key on it will not show voltage. Everything works engine cranks...


If it is overcharging ( how do you know if the voltmeter is not working) then the problem will be either in the regulator of the alternator or the rectifier of the alternator. I would be looking at a blown diode in the rectifier allowing the alternator to produce ac current that will not work an voltmeter that is dc. The ac current is affecting the ability of the regulator to control the output of the alternator.

Dec 10, 2013 | Cars & Trucks

1 Answer

Is there any fan grounds


Yes, they would all be grounded. May be hard to find them because the electrical connector at the fan has the ground wire going back into the harness. The ground should be on the engine somewhere. Check the ground by using a voltmeter right there at the electrical connector for the fans. Figure out which wire is the ground, put positive lead of voltmeter on the positive battery post, and the voltmeter's negative lead into the ground wire terminal on the connector's harness side. If that ground is good, the voltmeter will register battery voltage. If the ground is bad, the voltmeter won't register.

Nov 14, 2012 | 1992 Ford Mustang

1 Answer

I have a 99 mercury villager, getting a 0340 code. it says its for a crankshaft sensor but vehicle doesn't have one. What does this code mean?


Hi, code 340 is for the camshaft sensor. Below is a test you can run to check the sensor. The PCM is above the glovebox. Do not disconnect or remove the PCM. Just remove the glove box and probe the back of the connector to access the pins indicated in the cam sensor test. Please let me know if you have any questions, and thanks for using FixYa.

1999-00 Vehicles

On 1999-00 vehicles, the camshaft position sensor must be checked with the engine running. If a no start condition is encountered, observe the MIL. With the ignition switch on and the engine off, the MIL should be illuminated. If the camshaft position sensor is functioning, the MIL should go out when cranking the engine.
  1. Run the engine until it reaches normal operating temperature. Leave the engine running.
  2. Using a voltmeter set to the DC range, connect the negative lead of a voltmeter lead to the negative battery terminal or chassis ground.
  3. Connect the positive voltmeter lead to the back of the PCM electrical connector in terminal 44.
PCM pinout

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  1. Observe the voltmeter reading. The reading should be 0.3-0.5 volts.
  2. Disconnect the positive voltmeter lead from terminal 44, and connect it to terminal 49.
  3. Observe the voltmeter reading. The reading should be approximately 2.5 volts.
  4. Perform steps 3 through 6 with the engine at 2,000 rpm with the transaxle in park. The voltage readings should be the same.
  5. If the observed voltages are not within specifications, the sensor may be faulty.

REMOVAL & INSTALLATION
The camshaft position sensor is part of the distributor assembly, and must be replaced as a unit. Please refer to Engine Electrical, Distributor Ignition System, Distributor, Removal and Installation for the procedure.

Mar 12, 2011 | Mercury Villager Cars & Trucks

2 Answers

Battery won't hold a charge


There seems to be a no charge state in this case. I recommend checking the battery first, then, move on to the charging system. Use the procedure below to isolate this issue.

Wear protective eye wear and clothing and remove all jewelry when checking your battery and charging system. Jewelry is a good conductor of electricity and is not recommended. Most batteries wear out every 3 to 5 years and need to be replaced. Always replace your battery with an equal replacement battery to assure proper operation. Automotive batteries have a positive terminal (red), negative terminal (black). Electricity is stored in the battery and then supplied to the vehicle when the engine is not running. While the engine is running the vehicles alternator charges the battery for future use. (Note: never disconnect the battery while the engine is running). To check a battery surface voltage, remove the positive terminal protective cover. Connect the positive side meter lead (red) to the positive side battery terminal. Connect the negative (black) side meter lead to the negative battery terminal. With the vehicle not running and the car sitting over night the battery voltage should be between 12.5 and 12.8 volts.(You will need to use a voltmeter for this testing procedure). If the voltage is not up to specs, replace the battery asap. If the battery is ok and showing good voltage readings; Move on to the alternator/generator drive belt and amperage test.

The alternator is rotated by a drive belt, which is, driven by the vehicles engine crank shaft pulley while it is running. Electrical voltage and amperage are generated to recharge the battery and supply voltage to the electrical system of the car. The alternator is held in place with mounting bolts. There is a main electrical wire on the rear of the alternator that supplies voltage to a main voltage junction box. If your alternator is not charging properly, your battery will slowly drain down from operating all the electrical systems in your car and stop the car from running. Most non charge states will be the cause of a loose belt or a low tension rate, due to a mis-adjusted alternator. Make sure you have enough tension in the belt for full rotation of the alternator pulley.

Next, you will need to check the alternators output with the Amp meter.

Testing the amperage output of an alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage(False reading); Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter will be required. Once the meter is connected start the engine. Next; Turn on all electrical accessories and raise the engine idle to about 1300 RPM. The alternator should produce the max amperage it was designed to produce. Example: a 90 amp alternator should produce about 88 amps. An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail(due to a failed regulator). An alternator is designed to operate at max amperage output only for a reasonable amount of time. Once you have verified the amp readings, check the voltage. To check the voltage, Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive). At engine idle, the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.


  • NOTE_ Be sure to inspect the battery terminals for connectivity issues such as corrosion and so fourth..

Nov 21, 2010 | 2003 GMC Sierra 1500

1 Answer

1996 SATURN 16 VALVE TWIN CAM BATTERY LIGHT CAME ON THEN TWO DAYS LATER WOULDN'T START


There seems to be a no charge state in this case. i recommend checking the charging system. use the procedure below to isolate this issue.

Wear protective eye wear and clothing and remove all jewelry when checking your battery and charging system. Jewelry is a good conductor of electricity and is not recommended. Most batteries wear out every 3 to 5 years and need to be replaced. Always replace your battery with an equal replacement battery to assure proper operation. Automotive batteries have a +positive terminal (red), - negative terminal (black). Electricity is stored in the battery and then supplied to the vehicle when the engine is not running. While the engine is running the vehicles alternator charges the battery for future use. (Note: never disconnect the battery while the engine is running. If the battery cable is disconnected from the battery a spark can be generated which can cause the battery to explode or a major electrical malfunction to occur.)

To check a battery surface voltage, remove the positive terminal protective cover. Connect the +positive side meter lead (red) to the positive side battery terminal. Connect the - negative (black) side meter lead to the negative battery terminal. With the vehicle not running and the car sitting over night the battery voltage should be between 12.5 and 12.8 volts.(You will need to use a voltmeter for this testing procedure)

The alternator is rotated by a drive belt driven by the vehicles engine while it is running. Electrical voltage and amperage are generated to recharge the battery and supply voltage to the electrical system of the car. The alternator is held in place with mounting bolts. There is a main electrical wire on the rear of the alternator that supplies voltage to a main voltage junction box. If your alternator is not charging properly, your battery will slowly drain down from operating all the electrical systems in your car and stop the car from running.(most non charge states will be the cause of a loose belt or a low tension rate, due to a mis-adjusted alternator. make sure you have enough tension in the belt for full rotation of the alt pulley)

Next, you will need to check the alternators output with the Amp meter.

Testing the amperage output of the alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage. Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter is needed. Once the meter is connected start the engine. Next turn on all electrical accessories and raise the engine idle to about 1200 RPM. The alternator should output the max amperage it was designed to produce. Example: a 90 amp alternator should output about 88 amps. Note: An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail. An alternator is designed to operate at max amperage output only for a reasonable amount of time.

((Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive) at engine idle the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.)))

Nov 10, 2009 | 1996 Saturn SC

2 Answers

91 Honda Accord Alternator (battery light comes on)


sounds like the stator is going out you may be better off buying a rebuilt one

Apr 28, 2009 | 1991 Honda Accord

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