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Weird behaviour with power supply


 

Hello everyone :)
I have recently came back to the ham radio hobby, and decided to remove some dust from my old FT-817 (not ND)
To my surprise, the unit refuses to turn on when connected to a 13.8V power supply, but when I use the 12V charger everything is normal
?
I have checked the power supply with a tester and I see the correct voltage on both ends of the power cable, so I'm a little puzzled.?
I don't think this should be a problem, since the radio should work just fine even with 12V, still I'd like to understand what's happening
?
Has someone experienced the same issue? I made a quick search on the topics and the FAQ, but didn't find any?
?
Thanks!

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