Problem with the Coleman Power Generators I have a Coleman Vantage 3500 motor runs no generator output what if it doesn't have brushes?

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.

After working on several of this style coleman generator,i have found that the lead wires in the windings that are soldered to where your brushes would contact tend to break.I don't know if it's a poor design or just a fluke,i would check to see if your getting continuity on the rotor and go from there.They seem to either "burn off" or just break.

there can be many reasons. need more info:
Is it Inverter typr generator?

measure output voltage - anything?
take back cover off generator itself, measure continuity of stator and rotor, and visually inspect windings. You'll find AVR module there too, it may be the reason.

check

avr / brushes if it has them

if not capacitor and diodes on the end of the armature

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.

Around 75 volts DC

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

the most comon problem...i've already answerd it like 11 times...
1-check wireing and brushes.
2-then check AVR card..

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Check for loose wiring connections, especially at the run or kill switch. Generators vibrate a lot so it could be as simple as something loose.

have you conected the brushes on the right way? the leads are + and -.

you can run it up and use a 12v battery and connect it to the brushes correct polarity, with the othe LEADS removed and taped can shock you and chect the out put it it around 100 120v chech the AVR or brush polarity.

If yours dont have brushes it will have a capasitor that is prob out of spec.

the gensets on coleman generators are definately nothing to brag about but i would start by checking the windings and make sure the brushes have a clean armature to ride on