Need help with fan extender for dual extruder!

Hello everyone, any help would be much appreciated

basically i have a MKS base, dual extruders and a fan extender, what I dont know is where to wire the power wires to on the board. Here's a low down of ma problem:

http://cdn.instructables.com/F2S/2EJ...SWA.MEDIUM.jpg
http://reprap.org/mediawiki/images/b/b5/MkS_Base1.0.jpg
http://img.yunqudao.com/UploadFolder...Default/85.jpg

the fan extender goes in the XS3 auxs (there are less pins in the schematic)
where do i connect the wires from the fan extender to the mks base?


thanks !

How I set my extruder fan power was to tap directly into the 12V power feed on the control board and to the extruder heater output. The power tap and switched leg of the extruder power feed a small timer/switch circuit board. The board has a 5 minute delay timer so when it first sees power to the extruder it starts a 5 minute power on timer that keeps the fan on for 5 minutes after the extruder has been turned off. This prevents the cold part of the extruder from heating up and saves wear and tear on the fan.