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Nissan NDG5A Voltage Regulator Board - Portable Diesel Generator

I am looking for a replacement voltage regulator board, with 6 leads (red, green, brown, white to a connector and 2 yellow to the battery) for a Nissan NDG5A. This is a very similar model to the Robins RGD5000, but I am not able to find any place that sells parts, used or new, for this generator. Any thoughts where I can pick one of these board up at? As an aside, he board is dipped so repair is probably impossible given once you try to take off the coating, you can't see the diods, etc that you want to test.

Any help would be great.

Thanks

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 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

  • 57 Answers

SOURCE: I have a honda generator em2500x voltage problem

My E2500 did this. Turned out to be dirt in the brush holders causing the
brushes to have less pressure in the slip rings. Stopping and restarting
joggled the brushes to make better contact until they wore down again.
Pull your brushes and make sure they slide easily in your holders. Also
you may need to replace them if they are worn too much or clean the
slip rings. Good luck. Doing your own repairs is fun.... especially when
they work.

Posted on Jul 29, 2009

Smooth_Gecko
  • 125 Answers

SOURCE: I disassembled my EM650 Generator and to clean out

Most generators (except the latest inverter generators)
produce power directly dependent on RPM's.
The governor adjustment is critical.
This usually is in the form of an adjuster that through a spring, applies a preload to the governor arm.
The governor arm is attached to a shaft that disappears into the motor. Inside there is usually a set of weights that when spun faster will attempt to slow the motor and when spinning too slowly will attempt to increase revs. The adjustment you need to make is to the preload spring.
They are very sensitive to the motor being in good tune so do the air cleaner, spark plug etc before trying to get it right. Under voltage can do more damage than over voltage so take your time and get it to a good steady correct voltage with your usual expected load on it. A safety trip out box gives you a way to test voltage with a load on & some protection.
Work safe

Posted on Oct 15, 2009

sal_kh_sab
  • 98 Answers

SOURCE: Coleman/Honda Generator - No Electricity

take a look at the fuse...if it seemed burnt then replace it.
if not.
then check the breaker...try connectting your voltmeter directly to the wire that goes into the breaker(directly to the +) and the other side to the regular (-).
if it read 220 volts then the breaker is down...so replace it...or you can use the outlet directly.
however if it didn't read any voltage,
then you should check the brushes...they are right next to the AVR module...(the two wires that come out of the AVR are connected to the brushes)
if the brushes are shattered or if there is no connection between each brush and it's connector then replace the brushes..
but if they seemed fine.then your problem is with the wires...trace every wire and check for continuity.
the problem has to be one of the things i mentioned.

Posted on Oct 30, 2009

ftw1952
  • 10319 Answers

SOURCE: I have a yamaha YG600D generator and replaced the

you have a weak rectifier if it will not produce the needed voltage. Rectifiers are checked with an ohm meter

Posted on May 20, 2011

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I need a rectifier or avr for generac 3500 xl genarator


Ebay and various places including the maker..

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    I have a generac 6500 mega force, that has a 60v output on the 120v outlet and 120v on the 240v outlet, the regulator board has a blue wired that acording to the wiring diagram was to be hooked up to one...


    You need to run tests on your alternator. We have made some videos to show you how to do this on our website. It is very easy!

    https://www.generatorguru.com/help-me-fix-my-generator-repair-advice/

    We also hold some parts for generac generators if you need them. You can purchase them on this web page:

    https://www.generatorguru.com/generac/

    If you need any more help, please contact our Engineers. They will be more than happy to assist you with repairing and parts supply!

    https://www.generatorguru.com/ask-the-guru/

    We are always happy to help!

    Regards,

    The Generator Guru Team
    World Leading Supplier of Parts and Spares for Portable Generators

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    Where is the voltage regulator on my homelite LR550 generator


    On the inverter board itself. There should be a couple capacitors, a transformer and a resistor that make up the voltage regulator in the inverter board.

    Sep 17, 2013 | Coleman Powermate Powermate 5000W...

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    1981 Harley davidson Sportster generator/alternator


    Hi Anonymous, correct wiring from voltage regulator is:
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    2. Red wire goes to "A" on generator
    3. Black/Tan wire goes to power side of ignition switch
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    There are a few more components to check in the system. From the information provided this is not a Kohler generator as Kohler makes all their own AC alternators under 350KW, seems you may have just a Kohler engine (probably a CH25). Cannot find any info on the voltage regulator which leads me to believe it may be integrated into the main controller. Curious to know who the manufacturer is. If the capacitors are good, try checking the diodes. A volt/ohm meter with a diode check will do. Voltage reading on one side and nothing on the other. If you have no access to a diode check feature, try reading it through a battery NOT SHORTED TO BATTERY hook a meter to a battery and put the diode between one of the leads to the positive, one way will read voltage the other will read open, no voltage, or OL. Look for any fuses or breakers blown / tripped. 6 VAC on the output is about residual voltage meaning voltage the alternator makes without any help from a voltage regulator or field voltage. This usually means the alternator / rotor windings are still good. This alternator is brushless so you could seperately excite this unit via a 12V battery through your field. Look for your exciter field winding, it should have some kind of label on it saying F+ and F-, apply 12V here momentarily on + & - respectively with the unit running and you should see your output voltage spike. This tests the alternator. If this tests ok, then check to make sure your wiring / fuses from the alternator to the controller or voltage regulator (voltage sensing leads) are ok. If all these check ok, it is likely you have a bad voltage regulator.

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    Jul 02, 2010 | Coleman Powermate Premium Plus 6250W...

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    Onan generator emerald III genset. I push the start button and the generator comes on as if it has started, as soon as I let the button go, it shuts down.


    Here are the most common reasons for your condition.

    CHECK IF ENGINE KEEPS RUNNING The most common complaint is that the engine starts but will not keep running when the START switch is released. This happens because the control board will not allow the engine to continue running if the generator is not producing voltage or if the oil pressure signal is not present. See CONDITIONS REQUIRED TO KEEP RUNNING on the Troubleshooting Chart for your model. If the engine will not keep running, do the following:
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    A2. Field Flash If there is no AC, check for 10-12 VDC at the FIELD FLASH pin of the control board during cranking. If the field flash voltage is not present, the control board is defective. If the field flash voltage is present, the wiring or regulator may be defective. To eliminate the wiring, check continuity between the FIELD FLASH pin of the control board and pin 7 of the regulator. If the continuity is good, either the regulator or the field circuit (rotor and brushes) may be the problem.
    A3 Field Circuit Check the field circuit by unplugging the regulator and measuring the resistance between pins 9 and 10 of the regulator’s mating plug. This reading should be 22 to 28 ohms. If this reading is too high, check the brushes and/or clean the slip rings (use the Slick Stick, or a similar tool). If this reading is too low, there may be a short in the rotor. Also, check the resistance from pins 9 and 10 to ground. This reading should be very high or infinity. If not, there is likely a ground in the rotor. If these readings are all good, the regulator is likely defective.
    3
    A4 External Excitation To confirm that the regulator is defective, turn off the generator’s AC circuit breaker(s), reconnect the regulator and apply 12 volts through a diode to pin 9 of the regulator plug (see illustration) while attempting to start the engine. CAUTION: DO NOT attempt this without the diode. If you do, there will be fireworks! Remove the 12 volts within 1-2 seconds after the engine starts. If the genset now continues to run and produces normal AC voltage, the generator is OK and the regulator is defective. If the genset does not continue to run but produces about 40% of normal AC voltage, again the generator is OK and the regulator is defective. If no AC voltage is produced, the generator may have a problem that is beyond the scope of this guide. Re-check all wiring for security and signs of damage. It may be necessary to take the unit to a qualified repair shop.
    B. Check the oil pressure switch as soon as the engine starts. Models showing "LOP to GND" under CONDITIONS REQUIRED TO KEEP RUNNING need the oil pressure switch to be closed to ground when running. If the voltage on the LOL/LOP SW pin of the control does not go to near zero, the switch is not closing. These switches sometimes stick open if the generator has not been used or exercised often enough. Multiple start/stop cycles and/or tapping on the oil pressure switch will sometimes fix it. It may be necessary to temporarily jumper the switch to ground to keep the engine running. This can be done at the switch or at the OIL LOL/LOP SW pin on the control board. Models showing "LOP Open" under CONDITIONS REQUIRED TO KEEP RUNNING have electronic governors and require the low oil pressure switch to be closed at starting but open during running. When the switch opens, the governor module places a ground on the oil pressure input of the control board (P1-5). It is OK to temporarily ground P1-5 on this model to keep the engine running. NOTE: See chart for oil pressure and oil level switch locations.
    C. If there is AC voltage present on B1-B2 or L1 AC, as applicable, and the correct oil pressure/level signal is present at the OIL LOL/LOP SW input of the control board, and the engine will not keep running, the control board is defective.

    This should help you get it going.

    Kelly

    Mar 08, 2010 | Watts Onan Portable Generator - 5000 ,...

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