I have a Coleman Powermate 1850 MegaPulse Generator Model PM0401853 which I am trying to help my father-in-law fix. Unfortunatley I don't have any sort of tachometer to check the speed but it starts easy and sounds right and I really don't feel that there is anything wrong with the gas motor itself.
So, I assume that my problem is in the generator side of things, it will only give me about 90 Volts @ 60HZ. Because the Hz is right I assume that the RPM's are correct, so why am I only getting 90 Volts?
If I manually overspeed the motor (and it really sounds like it is running too fast when I do this) I can get 120 Volts BUT the frequency is about 70 Hz (which again leads me to beleive that the engine speed is too fast). This is frustrating because if I had a bad diode or a bad winding I would think it would not work at all. But I cannot think of a reason that I would get low voltage at (what I assume to be) the correct RPM.
Some research on the internet let me to un-solder the diodes on the rotor and according to my voltmeter they are okay. What I need to know is what Ohm readings I should get on the rotor windings as well as on the different windings in the stator. Also, according to my voltmeter the capacitor is okay. The only manual I can find for this generator on the internet is the owners manual. Anyone with a techical manual for this generator perhaps you can help out...
Thanks in advance
** Follow UP** the folks at Powermate think it is a diode problem (unless I am using my voltmeter wrong, I already checked them).