Of course be very careful when modifying several hundred watt power supply wiring and test everything on the bench before plugging in your devices and components. My power supply just arrived and I plugged everything (works fine), until I decided to plug the molex connector into the power supply because a video said it 'could' enable pwm, so I did, when I turned it on, nothing happened, I disconnected it then plugged it back in when it was on, then the molex cable made a shock sound and the pc turned off. Otherwise if you connect two earth grounded supplies, there is a decent possibility of sparks. Probably also important to use an ungrounded plug for the small supply since I bet the main PSU is already grounded(earth ground). Just take an extra connector, cut the 12V wire and feed it from the new supply connect ground(0V) to your PSU ground(0V) so the PWM and fan speed signals won't get confused. The important thing is then to connect ground but create a separate 12V rail just for the pump and lights and not let that reverse feed your main PSU. And if you do have an older power supply that does have that Molex connector, you might want to get something like this device that will take a Molex connection. I see, that the pump goes to 24 watt, depending on your LED setup you might get away with using something like a 50W 12Vdc regulated supply. That would be for you to experiment with.
PC POWER SUPPLY MOLEX CONNECTOR FULL
It may go full power turbo on you or go off entirely. I'm not sure what the behavior of your pump is when there's no PWM signal on the fan header while the computer is powered off. Have you considered using a small dedicated 12V supply to power the pump and lights? It is because I want to keep my liquid cooling loop, as well as some LED lights, on as a showcase, even after my PC shutdown.
Please give me some directions to proceed.
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