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enter image description here

When I use a test light on my laptop charger's head, it turns on. That means it is shorted somewhere, right?

I used a 3 prong to 2 prong connector and inside it I connected the prong in the image that I marked to the neutral and the test light now won't turn on.

Why does it have current in the ground prong and what causes it? Is what I did safe?

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    \$\begingroup\$ Please show a precise schematic of the wiring and the 3-prong to 2-prong connector, as well as what the test light represents. Especially with safety-related questions such as these, being precise is very important. \$\endgroup\$
    – nanofarad
    May 15, 2021 at 20:14
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    \$\begingroup\$ Which country is that plug for? As it seems to be missing a fuse... \$\endgroup\$
    – Solar Mike
    May 15, 2021 at 20:33
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    \$\begingroup\$ On a safety note, be aware that the type G plug in the photo is a cutaway version that’s certainly illegal in the UK and if it isn’t in your jurisdiction then it ought to be. Unlike proper type G plugs it isn’t fused and the small body reduces the clearance around the pins. The saving grace is that the live and neutral pins are shielded so it is possible to extract the plug without electrocuting yourself. \$\endgroup\$
    – Frog
    May 15, 2021 at 20:35
  • \$\begingroup\$ @SolarMike there is a fuse inside the power cord \$\endgroup\$
    – Mohamad Aminzadeh
    May 15, 2021 at 21:02
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    \$\begingroup\$ Since the mains input of a 3-prong power supply would most likely have filter caps from live and neutral to earth/ground prong, yes, there would be some small amount of current flowing, maybe few hundred microamps tops. But I feel like that is not the answer. And modifying equipment to have the earth/ground being connected to neutral with your own wiring at the plug is dangerous and should not be done, no doubt about that. Any fault in the system could make your laptop case dangerous. \$\endgroup\$
    – Justme
    May 15, 2021 at 21:41

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