Question about Coleman Powermate Premium Plus 6250W Portable Generator

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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.


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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


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