OK, here is what I got. In the generator shed are twin Chinese Honda clone 3,500 watt 20 amp 120 volt generators like the ones sold under a dozen brands. Backup firepower is a 5,000 watt DeVillbiss gas hog that is seldom fired except the monthly maintenance run. Power supplied to essential items during power failures through 12 gauge extension cords from the shed into the house. The cords and generators are plugged into a pair of Leviton 5500-192 megabucks surge supression PDUs rack mounted in the generator shed. Distribution in the house is via Wiremold J60BOB rack mount PDUs. No connection anywhere, anyhow to house wiring. The issue/question. Until this year I have run the generators without grounding rods connected to the grounding lugs on the generators without problems even though the manual says to ground the generators. On the PDUs I have "Power", "Ground Good" and "Protection" leds. All light when running without grounding rods connected to the generators. This year I decided to ground the gensets. With the grounding rods connected I get no "Ground Good" light on the PDUs. Disconnect the grounding rod and "Ground Good" lights up. What is happening ground wise here? I know squat about electricity and never will. The web provides a great way to get totally confused about "bonded" and "floating" neutrals with portable gensets. Most contradicting. If the problem is the grounding rods I don't understand why the manual says to ground the things. Any wisdom appreciated. I don't want to fry me or any equipment.