Quick question about power cables, 4 wires...Red1, Black2, Black3, Yellow4. 1 & 2 complete the circuit and 3 & 4 complete another circuit. I know more voltage flows through 3 & 4. I just wanted to know if someone knew the voltage across those to those 2 sets of points. I have 3 case fans, one originally came crimped into 1 & 2, but im going to splice into 3 & 4 because the other to are that way and they push alot more air. Also i did a test with a christmas light bulb and put it through 1 & 2 and it lit up like normal, 3 & 4 and it was blinding me.