Whelen TIR6 500 series alternating flash pattern

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Hello all,
I have a TIR6 500 series lighthead that doesn't have the 3/3 alternating flash patterns. Is it because it's an older model? I cycled through all the patterns and they were all simultaneous. (not talking about phase 1/2) Thanks.

 

[tsquale]

Not all TIR6's are considered or made to be "split heads", though I can't remember for the life of me how to tell the difference. I'll see if I can find literature describing that. I can't recall if it is only split colors that are or if solid colors were available as "split" as well

 

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5:21, 7:58, 6:25