no power on gps socket side apm2.5

good morning to all

i 'm discovering APM and i have some issue with the GPS side socket on the APM 2.5

i loaded the quadcopter 2.8.1 with the mission planner 1.2.29 and i use the 3dr gps mtk v2

my copter is flying well but i can not use the gps, it doesn't light at all neither blink.

i test through CLI test but nothing than point after 4minutes

i checked with a voltmeter and on the gps side socket i have no power but on the gps top socket there is power!!!

please help me to find the solution.

i checked the power setting of the apm (previous post on the site), try with another cable but nothing

please help i'm stock

regards

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