Shues your not 100% correct, not all mx arrowsticks were ground switched, the very first ones were positive switched, the light board actualy grounded to the frame of the lightbar via the mounting legs, and the center assy had a ground wire. you just need to test your bar and figgure out what the bar is, w/o the controler hooked up or anything just ground the lightbar frame and apply power to the arrowstick wires, if nothing lights up then try hooking power to the 2 red wires, and apply ground to the colored wires, if you have a ground switched bar this is how they should light up.