Pixhawk 2.1 using dual here gps

Hi, i have pixhawk 2.1 and 2 here gps. When i connect both gps to the pixhawk, gps1 is turning on, and gps2 is off. What is the problem? When i connect only the gps2, is turning on.

I do think if you use dual here GPS only lights on one of the GPS comes on (gos one if both are connected) but both are “active”. Maybe someone can confirm this but this is how I did it when using dual here GPS. It’s been a while since I tried it and I think this was my conclusion.

So how can i know if the second gps is work?