Question about Pramac Honda 7500 Watt Generator

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Avr what is in a generator

Es 7500 was working fine then we lost poer to the house. where do i find the avr to check for damage

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  • Gail Seely Oct 31, 2012

    engine runs fine but no power to house

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My generator does not supply power I have checked there is no current from the generator housing I have also checked the power diode and they are fine


Try flashing the rotor field. It may have lost its magnetism. Most standby generators will lose this if in long term storage.

If you don't know to do this have someone that does as you can damage your generator's alternator if done incorrectly.

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1 Answer

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If it has sat, it may have lost it's rotor residual magnetism.
Disconnect the rotor field wires at the AVR or on the exciter/brushes. Note they are polaroty sensitive. Connect a 12V battery to F+ and F- (note polarity) and momentarilly power from the battery for a few seconds. DO NOT forget to disconnect the rotor/exciter field wires first or the voltage regulator will be damaged.

If it hasn't sat check voltage regulator, rotor resistance, and stator resistance, and for shorts to ground.

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1 Answer

The gt5250 power back generator has stop producing


If it has sat, it may have lost it's rotor residual magnetism. Disconnect the rotor field wires at the AVR or on the exciter/brushes. Note they are polaroty sensitive. Connect a 12V battery to F+ and F- (note polarity) and momentarilly power from the battery for a few seconds. DO NOT forget to disconnect the rotor/exciter field wires first or the voltage regulator will be damaged. If it hasn't sat check voltage regulator, rotor resistance, and stator resistance, and for shorts to ground.

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1 Answer

Brushless generator has stopped producing power ,


If it has sat, it may have lost it's rotor residual magnetism.
Disconnect the rotor field wires at the AVR or on the exciter/brushes. Note they are polaroty sensitive. Connect a 12V battery to F+ and F- (note polarity) and momentarilly power from the battery for a few seconds. DO NOT forget to disconnect the rotor/exciter field wires first or the voltage regulator will be damaged.

If it hasn't sat check voltage regulator, rotor resistance, and stator resistance, and for shorts to ground.

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1 Answer

My 7500 watt generator doesn't produce any power


If it has sat, it may have lost it's rotor residual magnetism. Disconnect the rotor field wires at the AVR or on the exciter/brushes. Note they are polaroty sensitive. Connect a 12V battery to F+ and F- (note polarity) and momentarilly power from the battery for a few seconds. DO NOT forget to disconnect the rotor/exciter field wires first or the voltage regulator will be damaged. If it hasn't sat check voltage regulator, rotor resistance, and stator resistance, and for shorts to ground.

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1 Answer

Power went out motor goes no volts why


If the fuses are good, your AVR (Automatic Voltage Regulator) may have failed or (less likely) you may have lost the residual magnetic field in your armature. With the generator off and your circuit breakers closed, plug in a corded 120V drill into one of the household 120V outlets on the generator. Spin the drill's chuck quickly, by hand, several times; This introduces a small electric current to your armature, "field flashing" the generator. Start the generator and check if the generator is now producing voltage. Sometimes this works, sometimes it doesn't. If no voltage, then it's likely your AVR has failed. You can purchase these online at ebay for about $35.00-$50.00. Buy a couple of them; these AVRs have a high rate of failure.

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1 Answer

Generator avr


The AVR automatic voltage regulator normally gets damaged by a short in the rotor, wiring etc. MOST common is shutting the generator down under load and NO NO. The AVR goes wide open to try and maintain voltage on a gen that is stopping, always disconnect loads then shut off

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1 Answer

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There are at least two AVRs for this generator. The original AVR has the diodes mounted on an external heat sink. The updated AVR has the diodes mounted directly on the circuit board. I have a schematic of the original model with the external diodes but it doesn't have the values or parts on the schematic. I will be more than happy to e-mail you a copy of what I have.

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1 Answer

Have B&S 7500 Vanguard Genset. No Output. Have checked windings as per info on this site. Applied 12Vdc direct to the brushes and get 160Vac output. There are black/red wires from brushes that go back...


Hi, a word of caution, use a 9volt battery instead of 12v to check the rotating field winding. The 12volts from a car battery or battery charger can burn out windings in a generator. I would say that your avr is pooched. There are 4 leads that go back to the windings in the generator from the AVR. Two of these are connected to the power output and two go to a separate winding in the generator. This is the exciter winding and this supplies power to the avr for the rotating field. The two to the power output are voltage reference only. If your generator has these exciter winding, you should check if you have voltage there with the 9 volts applied to the rotor. If you have voltage on the power output and not on the exciter, then the exciter is shot and your avr might not be. Try this first, if you could, could you take a picture of the windings at the back end of the generator, this will confirm for me what leads you have present.

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2 Answers

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portable generator head stoped making power engine runs fine sircut brakers are fine

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