Question about Honda Mmd 5000 Watt Generator W/ Engine Ngk 6000H

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NGK-6000H Generator Field Coil Diode


I need to find two field coil diodes for NGK-6000H Generator. I have researched the internet, but wasn't able to find anything. Please let me know where I can find these diodes. Thank you very much!

Best Regards,

Ilian Nachev.

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  • simeonadvanc May 11, 2009 didn't have the part number, but I found the company that provides parts for NGK 6000H generator and they will help me out.

    For future reference, the name of the company is: Nagata Technology, Inc. Their phone number is: 847-439-0321.



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If the doides have a number on them, goto and cross reference them to a good number. Then you can find a dealer on the web site also.

Posted on May 11, 2009


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Getting NO power from the MR2 160/2 Mecc Alte Spa altenator stator. Generator repairman said he didn't find anything wrong using his voltmeter. Measured 6 vac out. I tested caps and they seem good....

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.

Jul 15, 2011 | Kohler Electrical Supplies


Generator Not Producing Power - Field Winding

There are 4 requirements that have to be met before a generator is able to produce power. Due to number of questions that have been asked, a Coleman PowerMate 1500-1850 with a Briggs and Stratton Engine will be used here.

1) The Engine has to be turning at correct speed
2) Field Winding (Rotor) on the alternator must be energized
3) AC Winding (Stator) must create a voltage in presence of magnetic field
4) Output passes through Safety Devices before it reaches an outlet.

This Tip will cover the Field Winding.

The alternator of the generator is similar to the alternator in your vehicle. A current flows through the field winding, and creates a magnetic field. This magnetic field is rotated (by the engine), and the magnetic lines of force cut through the many coils of wire that are located in the stator.

First things first though. Lets see if the field winding (aka rotor) is any good. You will first have to disassemble the generator / alternator to get to the brushes. The brushes are how the current flows from the regulator, and into the rotor while it is spinning. Look closely, and you will see 2 rings on the rotor. Each ring is the end of the coil of wire that makes up the rotor. Using a multimeter, check for resistance between the rings, but make sure that you don't scratch or gouge them. You should have some kind of continuity here, compare your readings against what is published in the service manual. Also check each ring to the core or rod of the rotor as well. There should NOT be any continuity at all. If there is, this indicates a grounded rotor, and will have to be rewound (starter / alternator shop) or replaced.

Look at the brushes and brush holder assembly. Take a measurement of the length of each brush, and compare it to the minimum length in the service manual. If the brush is too short, or shows signs of overheating, shock, or otherwise, replace the brushes. If the brush holder is also darkened or burnt, it will also need to be replaces as well.

From the brush holder, follow the wires to the voltage regulator. In most low end generators, this is merely a capacitor that samples output voltage, and feeds it back into the rotor. There should also be a diode here as well. Again, using your multimeter, check the diode to see if it is open or shorted. If your meter has a diode check function, use it. Otherwise, check the diode using the resistance scale. You should have a resistance in direction, and infinite (open) in the other. If you have resistance in both directions, or infinite in both directions, then the diode is bad and will need to be replaced. Some meters will have a capacitor check, but the capacitor in the generator will likely be too large for this to work. Look for signs that the capacitor may be bad. Bulging, leaking, damaged terminals all indicate replacement is needed.

On generators that have an actual voltage regulator, you will need to consult the service manual for steps to check the regulator. Usually, regulators are not easily tested, and are replaced when other potential problems have been ruled out.

If a generator has sat for a long time, it may have lost its residual magnetism. When the engine is not turning, there remains a small magnetic field due to the properties of the iron / steel rotor core. It is possible that this field has dissipated over time. You can temporarily reestablish this field through a process called "Flashing." Basically, it involves connecting a lantern-type of battery between one of the brushes, and the core of the rotor. Consult your owners manual for the exact and recommended procedure.

If the field winding is testing good, its time to move onto the next tip:
Stator Winding.

on Jul 15, 2010 | Electrical Supplies

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Voltage shows 80 on 110v and 155 on 240v

if you take the end of the generator off you will see a rectifier or four diodes with a varister or a full wave brige rectifier, sounds like you have a bad diode, or a shorted exite winding to the rotor, the exite winding is a small turn winding feeds the rectifier board that ac signal is converted to dc to feed the rotor ,the rotor produces a magnetic field which rotates inside the stator windings , the magnetic lines of flux from this field cut through thre stator winding inducing a voltage in the stator coils. hope this helps

May 27, 2011 | Dewalt DG6000 Heavy Duty 6000 Watt Gas...

1 Answer

No output from coleman 5000W generator 10HP

Check that engine speed is where it needs to be (does it sound like it is turning too slow or too fast?).

Pull the end cover off alternator, you should be able to see the diodes for the field winding. Check the diode with a multimeter. I bet that you will find that it is defective. Also check continuity of the field winding, both wire to wire, as well as each wire to the core of the rotor. Take a look at the brushes as well for severe wear.

Oh, if the diode is blown, plan on replacing the capacitor as well.

May 23, 2010 | Coleman Powermate Powermate 5000W...

1 Answer

I have a petrol generator, it puts out 110 and 230 the switch that changes over is a on/on switch when it was running my mate switched it over to 110 from 230 and the was a flash now it does not put out...

You probably will need to replace the switch if it flashed over. I would disconnect it and document the exact connections before as there are usually a bunch of wires to the switch. Test the switch with an ohmmeter.

The flashover MAY have discharged the magnetic field of the rotor and you may have to "flash the field" to restore it. Google "flashing field" as there are a lot of methods.

Worst case is if the unit is a brushless generator and the flash over in the switch shorted the rotating diodes on the rotor. That will require servicing of the generator part of the unit to replace the diode modules.

May 03, 2010 | Coleman Powermate Powermate 5000W...

1 Answer

No ac power from generator

One sure thing is you better find a competent service guy.

It sounds like you have lost excitation to the field of the alternator. Without documentation I can't tell if this is a brushless type or brush type rotor.

In either case, the excitation needs to be restored. On a brushless type, either lack of residual magnetic flux to start the buildup of the field OR failure of the rotating diode(s) can be the problem.

In a brush version, investigate "flashing" the field on Google or trace out why there is no voltage to the field. Possible things for this are failed transformer, failed rectifier, blown protective fuse and or wiring.

Apr 21, 2010 | Briggs & Stratton 12 Kw Automatic Standby...

1 Answer

Generator starts but does not generate power

  1. Check for any blown fuse and replace. It can be traced directly from the output lines.
  2. Check field excitation. The field excitation is supplied by the battery to the excitation coil through a pair of carbon brushes. If the brushes are worn out, no excitation field is supplied and no output is generated. Replace carbon brush if found worn-out.
  3. Use an analog multitester to check the continuity of the carbon brush and the field coil.

Sep 25, 2009 | Honda Electrical Supplies

2 Answers

My generator starts and runs great, It is not

  1. Check for any blown fuse and replace. It can be traced directly from the output lines.
  2. Check field excitation. The field excitation is supplied by the battery to the excitation coil through a pair of carbon brushes. If the brushes are worn out, no excitation field is supplied and no output is generated. Replace carbon brush if found worn-out.
  3. Use an analog multitester to check the continuity of the carbon brush and the field coil.

Sep 24, 2009 | Northstar Generator 18 Hp, 10,000 Watt,...

1 Answer


The armature (rotating field) is powered by the voltage regulator for 'excitation' which is the term describing a magnetic, revolving field. This magnetic field 'induces' voltage into the stator windings (stationary outer winding), producing voltage for use at the recepticles. Some older generators used a 'permanent magnet field, instead of using a powered winding from a regulator and the voltage and frequency were set by the RPM.
Frequency is still a function of RPM, but the voltage is controlled by the voltage regulator.

Aug 28, 2009 | Electrical Supplies

1 Answer

Powermate pm0545212.02 wont generate

The exciter coil can be checked with an ohm meter. It will read fairly low ohms (probably under 100). There are diodes also. You can check them with an ohm meter too. They should read in one direction only. The red lead on the meter is + and that will conduct through the diode when your on the anode. When you reverse the leads of the meter, it should read infinite or OL.

Jun 27, 2009 | Coleman Powermate Powermate 5000W...

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