Whelen SS360 installation wiring

Depending on the era (i.e. there earlier ones) the purple wire causes the PS to go into high-power.
I don't have any really "new" SS360s but of the two samples I have (old ones - both double-flash), high power is enabled when you ground out the violet wire.

Attached is the only SS360 install manual I have from ~1997 - This is a pretty sophisticated SS360 as it supports multiple flash patterns and SYNC between multiple units.

This is specific part of this manual that spells it out:
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HTH
 

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