Changing Flash Patterns on Whelen Lights

[Guest]

Not sure about the light bar, only because I can't really change the one on the engine I work on.  The other lights have a white wire with a purple strip on the back of the light.  Ground that wire to the vehicles positive battery terminal, keep grounding the wire out till you get the pattern you like.  We remove the light head, find the purple/white wire and use a long piece of wire to change ours.  There might be a grey wire connected that syncs all the lights together, if yours is connected you have to change each light separately.  After all the lights have been changed, shut off the battery source and then turn it back on.  All the lights should be sync'd with the new patterns.