should i splice all three wires red, black and blue or just use one blue wire from one fan ond just use red and black on the both red + / black - / blue ?light or speed? Wanted to ask before i started cutting wires?
Only splice the power wires (usually red and black). Connect only one tachometer (speed sensor) wire (usually yellow but can be other colors) as only one fan can be read at a time.
You'll also need to know the current rating of the fans if you plan to connect two fans to one mobo fan connector. Most mobo fan connectors are limited to 0.5 Amp or less. So if your fans are rated at more than 0.2 Amp each, it may be too much for one connector.
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