Connecting a 2-wire fan to a 4-pin connector makes short circuit for my PSU

[jvinsnes]

I bought a 4-pin fan (the 4-pin on a psu) from ebay and its loud and it vibrates. I had an old fan that were a lot better, but it had no connector, just stripped wires. I cut the wires for the fan i bought from ebay so the wires from the connector is long and the fan wires are short. I connected the red wire from the new(old) fan to the red wire from the connector and the same for black wire. I turned on my pc, then when i plugged in the fan it sparkled blue and smelt burt electronics. My screen went black, so i though i broke the psu, but a resetart fixed it. I double checked that red and black were the same as the ebay fan, and it was. Why the heck did this happen then?!?

 

[CountMike]

Actually, it's black (-) and Yellow wires on Molex side that give 12v, red one gives 5v. But most likely that fan you bought is busted.

 

[jvinsnes]

Actually, it's black (-) and Yellow wires on Molex side that give 12v, red one gives 5v. But most likely that fan you bought is busted.

Both my fans works properly when connecting to a 12v battery, also, it is connected to black and yellow
Both the ebay fan and now(old) fan is connected like this: https://m.ebay.com/itm/4-Pin-120mm-PC-Computer-Clear-Case-Quad-4-LED-Light-9-Blade-CPU-Cooling-Fan-12cm/281897225063?hash=item41a2624b67:m:mdHCazJ8-ysizme97grRbXw

 

[zyh1987]

are they led fans?

 

[jvinsnes]

are they led fans?

Yes, both

 

[eric418]

Make sure you connected to the correct pinout:

https://help.moddiy.com/en/article/fan-speed-control-12v-7v-5v-129m2j5/