Generac 5500xl from 1999. Engine runs ok, but no power generated

See following link
https://www.generac.com/service-support/product-support-lookup

Check fuse and connections between start switch, control board, and starter solenoid.



ENGINE CONTROLLER CIRCUIT BOARD
GENERAL:
The engine controller board is responsible for crank-
ing, startup, running and shutdown operations. The
board interconnects with other components of the DC
control system to turn them on and off at the proper
times. It is powered by fused 12 VDC power from the

I has this problem after performing Schedule A maintenance. Called Generac. They advise this a trip caused by removing the fuse before work to prevent engine start up, The fix is to turn unit in off position and then press ENTER key.

The problem with the repair service is another matter. Emergency generator and it's switch gear are there for emergency purposes. It has to be exercised periodically. The switch gear should have a toggle switch to simulate a power outage. the switch cuts power to the sensor sensing power from the utility company. This tells the switch gear that power was lost, start the engine and switch over to generator power. Run for a period where engine reached running temperature and switch back to stand by to shut down. Do this periodically, and be grateful the event was not a disaster. Think of your back up electrical system as the spare tire of your car and similar equipment and enjoy your investment. Good people brings you happiness, bad people brings you experience !.

Assuming the generator circuit breaker is on, depending on the model it could be the voltage regulator or the slip ring brushes or both. If it's a portable it could be a capacitor problem.

With the engine off, check the exciter brushes and slip rings which supply magnetic power for the alternator winding in the stator. Also, check the motor-to-alternator mechanical coupling. Check the breakers for tripping. To service beyond this point requires a schematic of the alternator, a voltmeter, plus knowledge of what the schematic is telling you. Good luck!

Double check your brush istallation. positive side toward rotor bearing, if you put 12 vdc directly into brush pack and check with a meter at the 120 vac outlet and have low or no voltage, you may have no resistance in your rotor slip rings, excitor & main windings also need a resistance check. 12.6-16.7 ohms (rotor) 2.26-2.80 ohms (excitation) .26-.32/.28-.35 main or power windings. Note: unit running when appling 12 volts to brush pack. 2-5 second only, ( This test tells you the rotor & stotor are ok )

Measure voltage drop across the far ends of the fuse wiring (should measure zero), as one of the wires or it's connection to either end of the fuse may be open. Check the battery negative grounding connection at the frame. If all ok, you may need to find a wiring diagram for the machine. Does this unit have a low-oil-level switch which will kill the engine if set?

DO U HAV POWER FROM GEN ?

Look for blown fuse or tripped circuit breaker on alternator end. Alternator may have an open winding inside. Can you tell if the alternator is turning internally? Could be defective coupling between engine and alternator.