Question about Northstar Generator 13 Hp, 8000 Watt, Trifuel

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Putting out half the volts

My Northstar 8000 only puts out half the voltage at 60 hertz. Any ideas?

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  • rbhawaii May 11, 2009

    When I adjust the engine speed to 7200 RPMs the voltage is fine and it runs my electrical quipment fine.
    Sounds like a bad diode/varistor. Am I barking up the right tree?
    How can I check/replace them?

  • Michael May 11, 2010

    Is it running at normal speed?

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My 13 hp 8000 watt is not putting out any power dose it need to be exsited and if so were do i do it at?

Posted on Aug 25, 2009

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Try adjusting the motor speed the faster it runs the more power it will put out

Posted on Jan 19, 2009

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My generator works but the lights in my house pulse. Any ideas?


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I worked at a tool rental center while going to college and learned how to service generators. Most appliances/tools require 50 to 60 cycles at 110 to 120 v. Your engine was designed to give maximum horsepower at 3600 rpm. Adjust the engine speed to produce 60 cycles and the engine should be at 3600 rpm and producing around 120v max. (Some special generators were designed to produce 230v 180 cycles, check manual) If your generator incorporates capacitors check them for at least 95% of printed uf value. They should be removed from circuit for testing. If there are two caps and one is weak make sure the new cap reads close to value of remaining cap. Finally there is usually a voltage regulator that varies the power to the armature magnet trying to maintain steady voltage depending on amp draw and engine condition. This regulator has no adjustment and is pass or fail type of item. Good luck, enjoy

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