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[ I'm reposting this, as it will never get seen at the bottom of 14 comments in the similar topic I originally chose.]

I'm reopening this topic because I have the same issue. Last camping trip last Fall I discovered I had no DC power, though it was fine previously. As things go, I put off 'running it to ground', so to speak, until things warmed up this spring. Now I'm 10 days away from an important trip (!).

I have a WFCO 8725 converter, and have rewired the rat's nest with terminal strips, so everything is easy to check. All fuses are good, including at the battery. I've been trying to maintain the battery by charging a day or two each month, but you know how that goes; a day becomes a week, then a month... When I first checked, the battery was providing an even 13.5vdc, and I found 13.5v on all four circuits -- but when I added a load, power went to zero. A day later, I'm now getting 20vdc? (!) at the battery , and 10v at the circuits. Still, nothing works, even the LED lights. Should I assume the (relatively recent) battery is toast? The converter?seems?fine -- at least everything works on shore power.
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Alex Sproul
'05 Classic
'02 Suburban

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Don DeRyke
Sunrise, Florida

2009 Classic, 2020 Ford Escape, 2.0 liter EcoBoost, AWD.?
Previous TV 2015 Ford Escape 1.6 ltr EcoBoost engine.

I would first off double check your volt meter settings, make sure it is set to DC voltage and the proper range 20v etc .

Measuring voltage is funky.? Two dissimilar pieces of metal will generate a voltage, but the current is almost zero.? I've measured 12 something volts on circuits when the battery is disconnected.? Thus when testing to see if you have power, I recommend you get an electrical tester light.? It won't light up from dead circuits, even though a voltmeter will register nonzero voltage.

I'd guess you have a disconnect somewhere, and the voltmeter is giving a false reading.? Test the same stuff with a tester light.