Question about Electrical Supplies

1 Answer

PM0435003 Powermate - Damaged Capacitor on Board.


My generator stopped putting out current while running. It was under a light load at the time, maybe 1000W and is rated for 6250W peak.

I have followed some of your suggestions, and the only obvious issue is the electrolytic capacitor on the circuit board in the bell housing appears to have leaked badly. Slightly swollen and signs of chemical stains on the cover.

Is this alone enough to shut down the current, and if so, how likely is it that damage was done to the main stators?

And then the most obvious follow up question, where can I get a new circuit board, or the capacitor to repair this one?

Thanks for your council and help.


Posted by on

  • s1mcgoo1 Dec 17, 2008

    Mentioned Flashing the generator several times in different posts.

    Could you post an explanation of what this does, and how to do it?



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 169 Answers

Yes, having a leaky capacitor in there could prevent the generator from making electricity. This capacitor is the voltage regulation on brushless generators, and it's the smoothing cap on the models with brushes. I wrote a somewhat long explanation of how to troubleshoot powermate generators that may be of help.

Since writing that post I've found that the Pramac company has started suppling parts for powermates, you can find them at One used to be able to obtain a brand new board from the company but not any of the individual parts. If you're going to go the "Radio Shack" route, I suggest that you also check all of the diodes on the board, they may have been spiked when the generator shut down under load. I wouldn't think your stator windings or your rotor windings got hurt, but since you've go tthe thing apart it can't hurt to check them.


Posted on Dec 15, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My coleman 2500 powermate generater leak from top of carburater, help

The carburetor needs to be rebuilt - the float valve is stuck open.

Jul 05, 2014 | Coleman Powermate Portable Generator...

1 Answer

At 3600 rpms generator produces 133 volts AC

You cannot, speed is propertional to voltage on these, as they have capacitor voltage regulation. Do not use this for powering home appliances, it is common to see this design and not a problem. If you add load and it will decrease but so will the frequency

Nov 26, 2012 | Coleman Powermate Portable Generator...

1 Answer

My powermate is over charging. Lights are very bright and it ruined a TV

If your engine speed has not been messed with, your voltage regulator is the problem. Contact Coleman for a local distributor for parts or repair.

Dec 27, 2010 | Coleman Powermate Portable Generator...

1 Answer

The voltage is higher than 240 and 120. Its making 264 and 132

Engine speed is too high, and/or excitation capacitor is bad

Jul 08, 2010 | Coleman Powermate Portable Generator...

1 Answer

Have older powermate 5000 contractor gen. runs great but only puts out 5.5 to6.1 volts. has new brushes

Hello. Plug something into your generator's receptacle, say a trouble light. Then check the output. With no load at all [nothing plugged in, you will get a voltage reading that is low. regards, Joe

Jan 28, 2010 | Coleman Powermate Powermate 5000W...

2 Answers

Replacing engine on Powermate 5000W Generator

I would say, yes (given everything bolts up okay), but I wouldn't connect a full 5000-watt load to it.

May 30, 2009 | Coleman Powermate Portable Generator...

1 Answer

Powermate 5000 low voltage under load

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.


Mar 02, 2009 | Coleman Powermate Powermate 5000W...

1 Answer

Coleman Powermate only puts out 110V

If you haven't seen it yet, here is a page that may help with a manual or parts list.

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.
Whining, a burning varnish smell, and breakers that trip all the time are indicators of long term overload problems. This could happen if you had most of the load on one winding for a significant amount of time, or if the one winding mostly powered motor-like loads with high startup currents.

You may want to look at this answer I posted some time ago.


Jan 06, 2009 | Coleman Powermate Powermate 5000W...

1 Answer

Generator dose not produce power,just stop working.

Check the rectifier board installed under gen cover that powers the brushes. This board has a capacitor about 1 inch long and 3/4 inch dia. If the capacitor looks swollen or burned replace board or carefully remove cap and replace with similar. You can use a larger capacitor with same rating, just tie cap to rear cover. Also check the condition of the brushes. Parts are not too expensive. Check with jacksmallengines on the web for parts. enjoy

Dec 04, 2008 | Coleman Powermate Premium Plus 6250W...

Not finding what you are looking for?
Electrical Supplies Logo

Related Topics:

516 people viewed this question

Ask a Question

Usually answered in minutes!

Top Electrical Supplies Experts

Craig Butler
Craig Butler

Level 3 Expert

1723 Answers


Level 3 Expert

3289 Answers

Gene Haynes

Level 3 Expert

5245 Answers

Are you an Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides