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Have Powertech Diesel generator running our home. Recently had flickering lights and they came out and did something with voltage regulator. Now 4 weeks later the power seems as though it was turned off then kicks back on so power output is fluctuating in home up and down and they want it brought in for a lot of money. Any ideas on what I might have checked on it?

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Make sure Voltage Regulator is mounted tightly to the Metal frame of the generator. It may be overheating and shutting down

Posted on May 18, 2014


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Posted on Jan 02, 2017

  • 169 Answers

SOURCE: low voltage generator output

Hi there,
Nothing about the bumpy dirt road would have done this but the 10 years of storage might mean that you've got dirty slip rings. Plugging a drill into the 10Kw generator isn't going to tell one much about the power coming out of it, you need a stove :-)
After a camshaft replacement I'd want to use the "Hz" function of the DVM to make sure I was getting 60 Hz.


Posted on Feb 23, 2009

  • 83 Answers

SOURCE: Honda EMS 4500 Generator - High Voltage Problem

As far as I can tell on the wiring diagram for this generator there is no voltage regulator unless it's incorporated with the auto throttle unit.
To lower the voltage you need to lower the speed of the generator engine. To do this there should be a screw on top of the engine under the tank when your facing the recoil. This screw presses on a arm that controls your governor. Turning it in (righty tighty) will increase rpms, turning it out will lower them. You should see the voltage change on the voltmeter.

Posted on Mar 31, 2009

  • 1 Answer

SOURCE: I have a Coleman Powermate Pulse 1850 Generator.

If the generator hasn't been used for awhile the rotor may have lost it's magnetism. All you need is to re-excite it. There are several websites that explain how to do this. It's a good place to start.

Posted on Apr 04, 2009

  • 1714 Answers

SOURCE: no output voltage at all

The generator needs to be 'flashed' to bring back the excitation for output. Is this something you can do? Let me know and I can help you...

Posted on Sep 11, 2009

  • 2 Answers

SOURCE: no output from my generator

Check the capacitor in the generator head. Will onpen or short cause loss of excitation voltage. Just checked my GENERAC ( no output) and sure enough the cap is shorted.

Posted on Mar 22, 2010

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I need a rectifier or avr for generac 3500 xl genarator

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  • Jun 28, 2016 | Generac Electrical Supplies

    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

    2 Answers

    I have 2003 Saturn Ion and I have bought a new

    test the battery voltage while the engine is running, (you'll have to jump it again)
    if you know the battery, voltage regulator and alternator are good, you may have to check all the fuse-able links on the car, all the vehicle grounds, and the fuses and relays.
    if you put your battery on charge until it is fully charged and let the car sit over night and it is dead, either the battery is internally shorted or the vehicle is drawing far to much current and each circuit tested to find the short.

    Oct 01, 2014 | 2003 Saturn ION

    1 Answer


    To make correct voltage you need to make sure the engine is running at the corect speed first, anything over idle will at least give you some kind of output. Make sure you have no blown fuses and check wiring. You will need to check your field. Every generator uses some DC power source and feeds it into the alternator somehow in order to raise or lower voltage. Also check to see if its sensing voltage, at some point output voltage will enter some kind of controller or regulator. If these all check ok, you likrly have a defective alternator or controller / regulator.

    Jul 09, 2011 | Diesel Electrical Supplies

    1 Answer

    Hi, I have a 12V battery running my caravan's electrical system. I just included a very nice LED cabinet downlight put into the system, but when something else is turned on in the car, it slightly flickers...

    You should try measuring the voltage that the lamp is getting without something else running, and then with something running. If you are getting a large fluctuation in voltage, then a regulator might do the trick.

    Mar 02, 2011 | Advantus Replacement Bulb for Projection...

    2 Answers

    I've noticed that the light on my radio has started to flicker slightly, I just replaced my battery, could this be the alternator? This happens only when the car is running.

    It is usually nothing to worry about.It is not really the alternator itself but the voltage regulator.Most cars go for years after this starts before anything has to be replaced.

    Jan 18, 2010 | 1998 Saturn SL

    1 Answer

    My 2002 electra glide classic head light flickers when the bike is running?

    The voltage regulator is starting to fail. The headlight is flickering with the pulsing of the alternator when the motor is running. If you have had your Harley long enough, you are familiar with the "potato potato" sound when idling. That sound is the result of the 45 degree angle of the cylinders and the flywheel surging, which is absolutely normal. So, when the engine is idling and the alternator is surging in time with the motor, the voltage is surging as well; the voltage regulator is what steadies the power so the bike puts out steady light.

    So now we are back to beginning of my answer to you; the voltage regulator is failing and that is what is causing your lights to flicker.

    The voltage regulator is mounted on the bottom front outside part of the frame. An easy way to locate it is to get down there and find the oil filter, there is a box there with fins (heat sinks) right there. Change that and you will not have a flickering problem.

    Jan 13, 2010 | 2000 Harley Davidson FLHTCUI Electra Glide...

    1 Answer

    No charge

    You'll need to test to see if you are getting voltage from the brushes. This is a live test so, using something like alligator clips or such on the metal bracket of the brushes for your volt meter is a good idea. Simply start your generator with the volt meter leads attached to the the brush holders or exposed electrical connection to the brushes and see if they are producing electricity (120vac or greater). No voltage then it's your brushes, field, or stator. If they are good check the output of the voltage regulator. If it to does not kick down any voltage above 120 then it's your problem.

    Note most cheap generators do not have a voltage regulator. All generators depend on the correct engine rpm to achieve normal voltage. 3600 rpm is the correct speed on a two pole generator to produce 110 to 125vac and 60hz (normally found on gas generators). 1800 rpm is the correct speed for four pole generators (normally found on diesel generators). You may set your rpms slightly higher to ensure that it's maintained underload ie 3750 for gas. Diesels usually have very good governors and don't need to be set higher.

    Mar 29, 2009 | Coleman Powermate Powermate 5000W...

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