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You need to determine if it is a Brushed or Brushless generator and follow the tests on the link below. (You will locate the brushes on the end of the alternator in a 12o'clock position if they are fitted).
Try putting 12 volts DC across the commutator coils at the brushes, sometimes the generator looses it's magnetic field and this could possibly restore it but make sure it is a low current not a car storage battery.
Loaded circuit or open circuit? If loaded, brushes need cleaning before buying parts. Check manual for procedure on your model. The brushes are usually culprit. Make sure cleaned and tension springs are free. Use compressed air to clean out armature area where brushes located. Re install and test. If better but not fixed replacement brushes may be needed. If open ckt voltage is high this could be normal. Suggest you email product support to be sure.
Remove the end case on the generator end, locate the brushes and also the wires going to the brushes. Crank the engine while measuring the voltage on the brushes, note which lead is B+. Disconnect the brush wires and isolate. To flash the rotor you will need a battery wires with an in line fuse, connect the wires noting B+ to the right brush where you measured earlier (polarity is critical) then toucj on the battery for approx 3 - 5 seconds, this will rebuild the field in the rotor. Disconenct and re-assemble brush wires. When you start generator do not add any load for a while, until the rotor field has chance to re-saturate
Without a model number... I am guessing about what type / brand and MODEL of generator you have. I have to assume it is a Coleman Power mate.
Try flashing the field. Do this.. take and electric drill and plug into the outlets of the generator. Turn on the output power GENERATOR ON. Squeeze the drill trigger and rotate the chuck as fast as you can. This will induce voltage into the stator and they usually will start producing power. When it does produce power it will try to yank the drill chuck head out of your hand so keep that in mind.
If the above does not work...
Remove the small cover from the center of the endbell. It covers the end of the rotor shaft and has 2 brushes under the cover.
INSPECT the brushes visually (do not remove them yet)
Use a meter to read resistance by probing the electrical contacts of the brushes. You MUST read LOW resistance. This is the rotor winding.
No resistance or high resistance
Remove the brushes inspect for damage. Try to probe the slip rings of the rotor. (You might have to make a 14/2 Romex electiral wire extension to get some solid copper wires to touch the rotor slip rings) Again you must read LOW reistance.
If you have low resistance and the brushes are good.....
Reinstall the brushes. (TEST for AC) Start generator
STILL NO OUTPUT?!!!!
Use a meter on DC to read AVR voltage output to the brushes by probing the brush terminals. You should read 3 - 7 VDC. No voltage.... hmmmm Possibly an AVR problem but...
Rig up a 9 Volt battery that you TAPE the wires to the battery terminals and the case of the battery
Just loosely connect the 2 wires to the brushes. Wrap the battery with a rag it might explode if you don't remove it fast enough. Your going to yank this off as soon as it produces power QUICKLY.
Plug in a light or a small fan so you can see that power is being produced. Let it run a few minutes before shutting it down.
To do anything else I need to know your generator model number to do winding and voltage regulator checks.
You need to locate the the brushes and check to be sure the brushes are good. Then use a 6 or 12 volt battery to the proper pole on the brushes just for a few seconds. NOTE this can be Dangerous as you are using electricity and you have moving parts near where you will be working. Then try to see if it works Your winding may be shorted or open.
1 - Check the circuit breakers on the front of the panel where the outlets are located. 2 - Make sure the black molex plug on the back of the panel where the outlets are located is plugged in securely. 3 - Carefully take the plastic endbell off the generator ( you'll need a 7/16 inch wrench and socket) and look for broken or missing brushes, broken wires, etc. 4 - If you're not up for #3 take it to a good repair shop. :-)