If you can find the wires coming from the solar panel disconnect them and then put a voltmeter across them, you should see ~14 volt coming from the panel.
I have 3 panels and wanted to test each one separate so I too heavy blankets and covered all 3 and checked my solar display, it showed 0 amps, I then uncovered each panel individually and wrote down the amperage, and then confirmed the total.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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