You would see the same results using an extension cord. The issue is not the ground, it is the disconnected neutral from the ground in the generator.No, I'm connecting the Isobar directly to the outlet. I haven't tried to connect using an extension cord. I suspect the Coleman does have a floating neutral since it was connected to a breaker box during Gustav back in 2008. That's why I was trying to find a way to effectively ground it. I don't know for sure that the wiring fault is being caused by bad or no grounding, but I presume that is what is causing the fault to appear. I can try to drive the grounding rod deeper into the ground, but I didn't know if that is what is casing the issue.
It is always a good idea to have a ground rod connection to any generator when not connected to the house electrical panel.
This is better than a sledge hammer to get that ground rod in. You can get these at any hardware store:
Amazon.com : MTB Fence Post Driver with Handle, 12LB Black T Post Pounder Hand Post Rammer for U Fence Post Wooden Post : Garden & Outdoor