also, if the thermistor/temp sensor on the charger block goes, or one or more of the fets(circuit board items) goes, you’ll see a similar condition - the system goes awry, constantly thinking there is a problem, and cuts off to protect itself, yet cuts back on, and so forth, constantly.
It could be a bad inverter. Ours did this, after almost 4 years and 80,000 miles - it was also very dirty inside, as you might imagine.
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