Either you have a burnt bulb/bad connection on the green wire on all of your trailers or you have an issue with the vehicle or adapter.
From what you stated, I would look at the vehicle plug first. It is possible that the plug is making a connection enough to light the LED on the adapter but cant produce the amperage to light the bulb. Make sure none of the pins in the receptacle are bent and that should rule out the vehicle.
With the 7 way connectors I see alot of people plug it straight in. When you do this you have to seat all connectors in the plug at the same time. What I do is put pressure on the plug and move it in a circular motion as you plug it in to ensure it seats properly. Reverse to remove.
The quickest way to determine if its the vehicle, adapter, or trailer is to hook a buddys truck up to it and see what happens.
If you cant get a buddy to come out, check the bulbs, and trace the green wire back looking at all of the connections.
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