Question about Coleman Powermate Powermate 5000W Generator

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Generator started, ran briefly, then stopped sending juice

It had been a while since I ran the generator, but in a recent power outage it started up, and for about ten minutes supplied power. In quick succession there was a brown out, a clunking noise, and it stopped supplying power, while the engine continued to run. The reset buttons indicating short circuit or overload were not triggered. Any idea what the problem is, and what to do about it?

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  • Anonymous Feb 20, 2009

    THE GENERAC THAT I AM TRYING TO FIX,WAS HOOKED UP ON THE 240 VOLT PLUG AND HAD TO MUCH AMPERAGE PULLING ON IT AND IT QUIT PUTTING OUT 220 BUT ALL THE 120 PLUGS WORK AND I CAN ONLY GET 120 FROM THE 240 PLUG

    THANK YOU JJ

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  • 169 Answers

Hi there,
crclarkphd has a problem that sounds like a brush failure. The clunking noise was likely the remainder of the failed brush getting knocked around inside the back end of the generator so you need to take it apart and inspect things closely. Here is a link to a general solution I posted some time ago that may be of help.

Guest jj has a fried breaker in one leg of the 220 outlet. Even though it doesn't look tripped it's failed, check it with an ohm meter.

Regards,
Carl

Posted on Feb 23, 2009

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This problem sounds kind of bad, generators don't do well when the engine stops under load.
Start by checking the circuit breakers in the distribution box (outlet panel) - you need ot do this with an ohm meter. After that check the power windings of the stator with the ohm meter, be sure to check between the 2 windings (should be open), and from each one to ground with the winding isolated.
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You may want to look at this answer I posted some time ago.

Regards,
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