Ford F350 w/2K Inverter, use to work, now Ground Fault error

DIY
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I have a 2025 SuperDuty with the 2K inverter system. I have a Quattro II 120x2 on my RV. At first, I was able to connect the Quattro L2 to the truck while driving to charge my RV’s batteries via the Quattro (~10A) I found to be the sweet spot… But now after a couple trips with no issues, as soon as I turn on the Trucks inverter/generator mode, and connect the RV, I get a Ground Fault error. Again all was working great and I had it dialed in at 10A limiter on the Quattro.

I can connect L2 to a standard 120V/15A source at all works as it should, only when connecting to truck does the truck error out…

Anyone know the trick?

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It sounds like a fault with the ground relay in the Quattro. This relay is supposed to close only when you’re in inverter mode.
If this relay gets “stuck,” the truck detects a connection between N and PE… which normally should NOT be the case.
Normally, the Quattro only charges the battery when you connect it to L1…

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How old is the Quattro?

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Inverter is basically new, purchased in Jan 2026. I going to set the inverter to CHARGE ONLY next time I attach to truck and post update..

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I have a 2018 F-350. I removed the puny stock inverter and installed a Victron inverter in its place. So, I don’t have the issues that many of the Ford truck owners have complained about when connecting to the input of a Victron inverter/charger. I also don’t have any direct experience with the larger stock inverters, but I don’t think they handle N-G bonding in the same way.

Just for the heck of it I asked Claude if it could tell me how the Ford inverter in your truck works. It referenced this discussion: https://rvelectricity.com/fords-pro-power-onboard-generator-problems/

There is discussion here about some possible solutions: https://www.airforums.com/threads/finally-solved-the-ford-2kw-propower-and-victron-multiplus-incompatibility.1441283/page-2 I did NOT read through all of this to see if the “solution” is safe or not. But, based on other discussions that show the output power of the stock inverter to be crappy, I would consider disabling or removing the stock inverter and installing a Victron inverter in its place. Or, use an isolation transformer to separate the two systems. But, you’ll still end up with a crappy AC waveform.

Let us know how you ultimately resolve the issue.

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UPDATE: I placed the Victron Inverter in CHARGE ONLY on today’s 4 hrs trip, and the truck did not Tripp.

But Im still scratching my head as to how it worked on several previous trips without tripping the truck…