Ippo Posted February 20, 2018 Report Share Posted February 20, 2018 Hi Everyone: I bought a pack of 3 Riing 12 fans for a wind tunnel science project for my son. I want to run them directly from a 12V battery with the speed controller so he can have high and low speed. Any idea which of the 4 wires i need to connect the 12V battery to? Quote Link to comment Share on other sites More sharing options...
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