Question about Coleman Powermate Premium Plus 6250W Portable Generator

1 Answer

Starts fine but no AC

Hello Carl,
I am located in the NE New England and we were just hit with an ice storm. I am trying to help some people by providing some power via my generator. The Coleman Powermate 6250 (B/S engine) starts fine but no AC. I read your article and I beleive it needs to be flashed. I has been idle for 1year or more. Before I try all the electrical measurements I would like to try the flash method. ANy quick response would be great.


Posted by on

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

Hi Steve,
Sorry to take so long to respond, I didn't get the email telling me to look here.
Because you're in a dire situation I'll give the quick and dirty but very dangerous way to flash any generator. You're gonna want a friend to at least watch and shut the generator off if you get into trouble.

Make a pigtail from an unused 110v electrical cord, pretty much any cord will do but you want one that is easy to hang on to. You want about 1/2 inch or maybe less of bare wire at the ends of the white and black leads of the cord. Plug this into any of the power outlets on the generator.

Start the generator and let it come up to speed.

Using a 9v dry cell or a 6v lantern battery, tap the bare wires of the pigtail onto the battery terminals. Polarity won't matter. You want ot be very careful doing this because if it works you'll suddenly be hanging on to a 110vac live wire. You only need a very short burst of electricity into the power windings to get the rotors magnetic field going.

Once you've done the slap above remove the pigtail and plug in a light or some other small load for 5 minutes or so. We just want to make the rotor coil work for a bit to "recharge" the residual magnetism in the rotor.

Please be very, very careful - in the shop we only do this if there is no other way to get it done, and we work as a team with the spotter having his/her hand on the engine kill switch.


Posted on Dec 17, 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.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Charger not charging and motor runs fine

You need to check the rectifier first to make sure it has AC power on the 2 x AC terminals and 13.8V DC on the DC side, if you have AC and no DC replace the rectifier, if you have no AC check the stator windings

Jun 10, 2013 | Guardian Rv Generator 4800 Watt, Gasoline,...

1 Answer

Genset starts and runs fine but the 30 Amp circuit breaker trips as soon as a load (AC) is applied. Started right up, ran half a day, but now when it starts the minutes I click on the ac the circuit...

What about when you have it powering the motorhome, without AC on, does it trip then? Do you have anyone you know with a multimeter and knows how to use it? How about buying a plug in voltage meter at a hardware store as a good start. You simply plug it in to a receptacle in your motorhome and it will tell you the incoming voltage and they are not very expensive. That will help diagnose generator problem.

Nov 01, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

My generator starts fine but will not run anything

check the fuse...
then check brushes...if both are fine...
then check AVR card..

if u have any further questions do not hesitate to let me know:

Jun 25, 2009 | Electrical Supplies

1 Answer

Low voltage generator output

Hi there,
Nothing about the bumpy dirt road would have done this but the 10 years of storage might mean that you've got dirty slip rings. Plugging a drill into the 10Kw generator isn't going to tell one much about the power coming out of it, you need a stove :-)
After a camshaft replacement I'd want to use the "Hz" function of the DVM to make sure I was getting 60 Hz.


Feb 08, 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

6250 Gen that starts but no AC

He gives a good way to troubleshoot many of the Powermates. He's slightly wrong on 2 points:
1) Not all powermates have brushes, the smaller ones are brushless.
2) You don't really need 12 volts to flash, I prefer the 9v dry cell because it can't provide so much power that it fries your rotor (a car battery could).

Note that his method is much safer than what I described and you ought to do it that way if you can.


Dec 17, 2008 | Coleman Powermate Premium Plus 6250W...

4 Answers

Coleman Powermate 6250 only runs with choke closed/air restricted

A call to Elliott Small Engine solved my problem - Oil Guard. I had checked the oil and it was just a little low but seemed well within the normal range. I was told to add more, bringing it just over the Full mark. It seems that the low oil protection system is very sensitive and shuts down the engine even when the oil is withing 1/8" of the mark. I added about 2-3 oz of oil and no more problems

Dec 14, 2008 | Coleman Powermate Premium Plus 6250W...

1 Answer

Brand new Porter cable 5500w 10 hp generator - no output

I wrote an answer that was for powermate generators, but it should help you too. I think you have a brushless generator, and rather than the plastic endbell I mention in the post you have a metal pie plate held on by 2 phillips head screws (yours is easier to get to)

Rate me if this helps, ask directly if it isn't enough,

Dec 14, 2008 | Coleman Powermate Powermate 5000W...

Not finding what you are looking for?
Coleman Powermate Premium Plus 6250W Portable Generator Logo

849 people viewed this question

Ask a Question

Usually answered in minutes!

Top Coleman Electrical Supplies Experts

John Trevino

Level 3 Expert

1378 Answers

Shawn DuRee

Level 3 Expert

355 Answers

Phil Rivera

Level 2 Expert

83 Answers

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

Answer questions

Manuals & User Guides