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Disconneting generator from motor. PM54A4302 Coleman generator. I do not know how to disconnect the generator from the motor, I would like to know how to release the motor from the generator.

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I am assuming that you have removed the end bell with field winding (long bolts that extend from outside of generator into mount bolted to engine) and the only obstacle is the rotor on the crank of the engine. I am also assuming that you were able to remove the long bolt thru rotor into crank. Now you will need to apply penetrating oil to the shaft of the engine to loosen the rust on the taper (tapered shaft fits very tightly into core of rotor). It may take several applications. Place a piece of hardwood against metal to protect the rotor and firmly rap with hammer on both sides. You may need to use pry bar against engine and rotor as you hammer hardwood. Repeat as necessary, some rotors will be very stuck due to rust. Good luck.

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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Check the voltage sent to the field when running. It will probably be around 12 volts. You can try connecting a lantern battery BRIEFLY to the field to re-magnetize the field. Try bothe polarites.

Some have had a bad rectifier and one had a bad transformer that generaates the low voltage from the generated output. He had a broken wire from the winding to the wire from the transformer. He was able to reconnect the failed solder joint.

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I have a Coleman Powermate Powerbase 4000 Extended Run Plus Generator. Model - PM54a4302 Motor runs fine, not AC output. Brushes are fine. Does anyone have a test procedure for testing Field excitation. ...


Well, its not exactly a published procedure, but this is what I would do.

Check field for continuity between leads, as well as continuity from each lead to the core. Between leads, you should have continuity, but you shouldn't be able to measure anything (perhaps in megohm range) between leads and core.

Once you have continuity, check your diode. You should have continuity in one direction only. If not, replace diode. Don't worry about capacitor / regulator at this moment.

Check stator winding for continuity between leads, (don't forget the 12 volt winding too), as well as between each lead and the core. You should not have continuity to the core from any lead.

Make sure breakers are reset, then check continuity through them. Should have it, replace if not. Same goes for the outlet itself.

Reassemble the engine, and start it. Check for a DC voltage at the 12volt battery charger port. If you have it, then your capacitor / regulator is shot. If you don't have it, replace the diode (even if checked good) and the capacitor / regulator. If still don't have 120vac, you can try to flash the field by momentarily touching a small lamp battery (6 volt lantern) to the core, and to one of the brushes. Just for a moment. Then restart. Exact flashing instructions are usually in the user manual.

Have fun!

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The generator needs to be 'flashed' to bring back the excitation for output. Is this something you can do? Let me know and I can help you...

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I have a Coleman Vantage 3500 motor runs no generator output


This sound like a loss of residual magnetism in the generator. The field will need to be "flashed".This is also known as re-exciting the field of the generator.
The Coleman manual gives these steps:
1Use a 6 Volt lantern batters (dry cell) or a 12 Volt automotive battery.
2.Disconnect all loads from generator.
3. Remove the brush cover (that's the rectangular plastic cover on the end of the generator.)
4. Plug a lamp or light into the generator before starting the engine. The light will illuminlate when ?Voltage has returned.
5. Start the engine with no load connected to the generator.
6. Attach the "-" lead of the battery to the negative brush. Very briefly touch the "+" lead of the battery to the positive brush. Remove as soon as Voltage builds up.

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