I have a 10kw/8kw portable generator. started up and runs fine but no ac output. checked breakers, all are on ok but no power to receptacles.is there something i can try to reset generator?

http://www.ebay.com/itm/BRIGGS-STRATTON-GENERATOR-OPERATORS-MANUAL-ELITE-SERIES-6200-RUNNING-WATTS-/401042177246 $14.95

Site unseen i would say its neighter the brushes or the coil . And more the likely the problem is with a transformer converting the DC off the generater to AC for your output . If the engine runs ok and the armature in the generater spins ok and you don;t have a million hours on it should work at least somewhat . Try testing the output on the AC side see what you get for AMPS you will need a muilty meter set to AC amps

No electrical

output

1. Faulty receptacle. 1. Have Service Center

replace.

2. Circuit breaker kicked out. 2. Depress and reset.

3. Defective capacitor. 3. Have Service Center

replace capacitor.

4. Faulty power cord. 4. Repair or replace cord.

5. GFCI switch breaker kicked

out (if equipped)
5. Depress and reset

By ac you mean receptacles, not ac welding? 
If so what about welding output on AC (DC)?

If welding is OK then you may have breaker or fuse problem.
If welding output is also low or no output your problem is the generator.
You should check your gen rpm to be normal. If so you may have field problem: rectifier, AVR etc.
If you can measure the field DC voltage at rated rpm, if it is missing (very low) try to find any circuit broken.
If you do not succeed answer this instruction in order to give you more.

I would assume you checked circuit breaker on unit? There should be one over each receptacle (push to reset) and a 2 pole for the twistlok receptacle. Also check to be sure GFCI receptacles aren't tripped. Have you tested the output with a tester? If none of these are the problem , then most likely it is in the generator itself. They do have a 1year warranty (2 year parts)

I did not understand how you turn on generator, as it is always turned on.
If you use the ON/OFF switch it is stopping the prime mover.
If you reset the AC breaker without load, and it stops - it means that you have short circuit after the breaker. Check the output receptacles.
Try this link:
http://weborder.husqvarna.com/order_static/doc/MOUS/MOUS2008/MOUS2008-FG6000MK-7096FG6024-966991401.pdf 

portable generator head stoped making power engine runs fine sircut brakers are fine

Wow, your meter showed that you had 120v to each of your outlets as it was running? And when you would plug in one of your appliances, they wouldn't work? Mmm, something's not right here...:). Not sure if this problem has been resolved yet (just looking at the date), but I would start from scratch again. Turn everything off (breakers, etc). Start the generator again. Then turn your breakers on ONE at a time. Use your meter to check out each receptacle. Do this on EACH one. If everything checks out okay, then turn on ONE plug at a time again, check with meter again, and then use a low amperage appliance to plug in - and see if it works. Yes, it sounds tedious - but we're doing the process of elimination to really rule a lot out. Unfortunately, coffee maker's (because of their heating element) draw a majority of the load, so having this on the same circuit with other component's can affect things also. If you've repaired this already, great! If you had a minute, I'd be interested in hearing what the problem was. And if you haven't fixed it yet, feel free to contact me again - and I'll help you through with this. Best of Luck to you! - Jim 

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.

the instructions says the voltage regulator is automatic/digital. when you check the voltage is there any load on the generator? if applying load to the generator doesn't help, you can manually change the motor speed where the governor connects to the carborator, but it may change the frequency, but the regulator may fix it