Hello and thanks in advance for any assistance.
I purchased this unit, serial number 4133249, about 5 years ago. A neighbor who had recently completed Generac school installed it for me. Natural gas fueled with about four feet of fuel line from meter. It ran like a charm for about 1 year and then started shutting down with a over speed alarm. Engine would crank and run about ten seconds then shut down. My neighbor tried to repair several times by adjusting the throttle and performing electrical tests.
About three years ago I moved and brought the non-working generator with me. I'm now troubleshooting it myself. The gen. is now LP powered by a 20 pound tank connected with a two foot black hose about 1 1/2 inches in diameter. The gen. carnks and runs about ten seconds and then shuts down. The green LED and all four red LEDs flash the entire time it is running. The reds flash faster than the green one.
I performed diagnostic test 70 with a Fluke 87 III dmm. Step 5, wire 66A continuity passed with zero ohms. Step 6, wire 55 continuity passed with 1.6 ohms. Step 9, wire 66A voltage test failed with .02 volts. Step 10, wire 66A HZ test failed with zero HZ. The only way I could see to test wire 66A at J1 was to jam the test lead into the connector where the wire 66A came in so I can't guarantee I was making good contact, but I think I was. I proceeded to test 7.
Test 7, step 7, power winding test wire 11 to wire 22 passed with .2 ohms. Step 8, power winding test wire 33 to wire 44 failed with a open circuit reading.
Step 9, battery charge winding passed with .15 ohms.
Step 10, engine run winding passed with .1 ohm.
Step 11, power winding-sense leads was .3 ohms and I could not find a reference value for this test.
Step 12, excitation winding passed with 1.6 ohms.
Step 15, stator wire 11 short to ground failed with 3.1 ohms.
Step 16, stator wire 33 short to ground failed with 3.0 ohms.
Step 17, pin 1 short to ground test passed with open circuit.
Step 18, pin 3 short to ground test passed with open circuit.
Step 19, pin 5 short to ground test failed with 2.9 ohms.
Step 20, pin 7 short to ground test passed with open circuit.
Step 22, stator wire 11 and 33 shrt test failed with .5 ohms.
Step 23, wire 11 and pin 1 short test passed with open circuit.
Step 24, wire 11 and pin 3 short test passed with open circuit.
Step 25, wire 11 and pin 7 short test passed with open circuit.
Step 26, wire 33 and pin 1 short test passed with open circuit.
Steps 27 - 31 all passed with open circuit.
Steps 33 - 36, control panel wire continuity all passed with .3 ohms.
I would really appreciate an interpretation of these test results. I'm not very knowledgable about generators. I'm thinking the stator windings have probably shorted out.