Question about Coleman Powermate Powermate 5000W Generator

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Powermate 5000 low voltage under load

I bought this used, cleaned up the contact ring, performed a flash and I have 125V at the recepticles. If I connect a 1 KW tool and try to use another power tool, the 2nd won't fully power up and I get 90 volts while running at 3650 RPM.

The capacitor checked out, the unit runs fine and the generator produces power but when it needs to start another electric motor while another tool is running the 2nd tool won't spin up...just turns at a slow RPM. The tool will run when it's the only thing connected, but not when something else is powered also....both are less than 50% of the generators output.

I get 118V with a vac attached, add a saw I get 90V.

Could this be a bad board?

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  • i6pwr Mar 02, 2009

    Could possibly be true. Perhaps a larger capacitor for the circuit board or maybe piggyback another capacitor with the existing one.

    Not sure if it's possible but if it is, what would be the largest I could safely use and possibly fit under the cover?

  • i6pwr Mar 02, 2009

    Peak wattage is 6250, 5000 continous. The brushes are roughly 5/8" long, maybe 11/16". Didn't check the diodes but none looked discolored or swollen. The engine responds immediately to the load, from what I can tell the windings look good and the resistance across the contact rings were in spec.

    I have a Fluke DMM and a current clamp so I can test loads if need be, hoping it's something simple first.

  • Thomas F. Schneider May 11, 2010

    Peak wattage 5,000? Is not the amp draw to start a power tool at least three times the run amperage. Using that three times rule what would be the wattage used to start it? Is you excess capasity stil their or short of even working?



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It could be a bad board but it sounds more like a bad set of brushes. If there is less than 1/4 inch of the brush (eihter one) left I'd replace both of them. I'd also check the diodes on the board with a DMM.


Posted on Mar 02, 2009


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