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I would suggest being more precise when describing the tests you did and the results you got, you raise nearly as many questions as you answer.
What was beeping, a multimeter in continuity check? But you said you bought a test light? Does the test light beep? But then again you would not expect it to beep if you're probing the contacts in the fuse block, so why do this? is that what you tested for "without the fuse", is a beeping DVOM what you were using, were you testing continuity between both sides of the fuses, removed the fuse block?
The test light you bought I presume has both a positive and negative clamp and shows voltage (green) and ground/0V (red) depending on where you are probing with the pointy end? With the fuse removed and sticking the pointy bit in the fuse block, one pin with voltage and one with no voltage is what you would expect, it sounds like what you did...
And "both light up"?
The easier way to test a fuse is to power the circuit, in this case it's an always hot so it's always on, and simply stick the pointy end of the test light on the exposed bits of contact on each side on top of the fuse as it is installed in the fuse block. You should have voltage on both sides.
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