Some standby generators if unused for a wile or shutdown under load will loose their residual magnetism and no puta out. An easy trick to try is to plug a corded electric drill into a running genny, pull the trigger and give the chuck a good spin with your hand. It should start to run and the generator should be back to normal. This restores just a little magnetism that will build back to normal. I got a nice free generator that didn't put out, and this trick worked, its worth a try. Frank C.