This connector does not work! The solution has been simply cut the 3-wire plug from the case (or exchange it for another) to make possible to conect to the "regular" (2-wire) power led connector on the board, which works.
Other message about this same problem:
There is a newer revision of the board (G10491-400), to be released later this month, that will fix this issue at last.
Thanks for your reply. I will cut my connector in half.
I now have a power LED with only 2 cables a "+" and a "-".
Regardless to which header I connect the Power LED main or alternate the light never lights up; I also tried reversing the cable orientation to no different result.