Question about Coleman Powermate Premium Plus 6250W Portable Generator

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Powermate 5500 no Power on plugs, shorted stator symptoms?

We have a heavy use 5500 which no longer puts out any power to the plugs (240 or 115s). We have gone over everything (brushes etc) to no avail. When we put a DVM to it we found that all the power plugs (+/-) and gnd are shorted. This does not sound right, is this a symptom of a burned out stator?


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  • altitude909 Jul 30, 2009

    Thanks for the comment. I did solve it btw, as it turns out, the connecting wire to the rings on the rotor broke in the silicone reinforcement (it was the inside one so it was hard to see). There was inf resistance (open circuit) when I took the reading with a DVM where it should have been ~3.5 Ohm. I simply soldered in a thick gauge bus wire to make up the length since the wire in the broken state would not reach the terminal and i am back up and running!



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Stator resistances should be around .5 ohms. This may look like a short to you. Unhook the regulator from the field brushes and put 12 volts on the field winding. you should get output to partially light a bulb..maybe 60 volts. Remember to use 12 volts dc on the fields and don't reverse the polarity.
If there is output then the avr(voltage regulator) is probably bad. If there is no voltage then check the resistance on the brush contacts. through the bushes and field. Maybe around 25 ohms. Your generator manual can give the exact ranges. No resistance then clean the brushes and slip rings and check again. No resistance...take reading on the slip rings. No field...bad rotor. Good luck....keep posting until problem is resolved.

Posted on Jul 30, 2009


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