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Coleman Powermate low voltage

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Posted by Pumbaa on June 23, 2009, 8:58 pm
Forgive the cross post, I was sent here by someone at alt.home.repair.

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).

ALSO, I am using a Craftsman Digital Voltmeter (I have an old analog
meter if that is better).
For the Hz I am using a device called a KILL A WATT, don't know how
much I can trust it, but, it is the only thing I have that shows

Posted by news on June 23, 2009, 9:44 pm
On Tue, 23 Jun 2009 13:58:05 -0700 (PDT), Pumbaa

The KillAWatt is certainly satisfactory for testing voltage and

I would suspect something in the ekectronics of the generator, but
don't have a diagram for reference.


Posted by You on June 24, 2009, 7:36 pm

I would suggest that you take your problem over to www.smokstak.com and
get one of their Resident SmartGuys, in the Generator & Motor Forum to
advise you.....

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