Changing Flash Patterns on Whelen Lights

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600 Series Super LED on front and side, and 900 series LED's on the rear.  The lightbar is a whelen ultra freedom

On the 600's take the white/purple wire and tap it to a positive source for less than 1 second.  This will change the pattern.  If the light heads are synced together you will need to advance ever light head to the same pattern.  The 900's will be the same way, unless they only have 2 wires, which will prevent you from changing the flash patterns.