I have a Mean Well Switching power supply 5V. I have connected 5V output to rpi's 3b+ gpio pins to power it up, but the supply is just going up/down like it has no power drain. can you recommend how to make it hold the voltage?
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Somebody on Amazon worked around this by adding a resistor as a dummy load, and wrote it up in their review, but this doesn't seem like a great idea to me.
I'd use a different power supply, or use a buck converter from the stable 12V supply (if it is stable, and not also resetting when hiccup mode kicks in) to get 5V for the Pi.