arcade cabinet control issues

[ale76]

im currently having problems with my arcade cabinet controls the issue is that when playing any game 2 players when you move the control stick down both player 1 and player 2 both move down at the same time all other directions and buttons are working fine any ideas to what may be wrong with the connection i believe the jamma down direction is W 19 ???? what should i look for or do to resolve this problem?

thanks

 

[virtvic]

Are the ground and down wires reversed on the microswitches?

 

[virtvic]

Or, the 2 pins on the jamma loom touching each other? - that'd do it.