Connecting Anet 8 2004 display with Ramps 1.4 to Aux2 can't seem to figure it out
This answer clearly describes that you need to switch pins 1 and 2. It also describes that the MKS board is similar to a RAMPS board. 

First thing to look for is the layout of the AUX2 header:



The pin layout reveals that pin 1 is VCC and pin 2 is GND. These need to be switched to be able to connect the display on AUX2.