The wires are the ones in the plug that connects to the FSR. I made a pair of copper wire links to patch from the +12V feed to the FSR to the Fan and another to the ground lines. I used the same copper links to scrape the inside of the female part of the plug to clean it

So you need to remove the plug from the FSR. Connect the Yellow/Green wire to the Red/Green using a link wire

connect the Brown wire to the Black/Green wire using a link wire

If the fan runs then its not the fan thats broke and you need to clean the connector/plug to the FSR