Relay based generator not working?

Question

Electronics

The yellow LED does not light up when the button is pressed: it never lights up at all, although it should when the button is pressed.
Red is on all the time.
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Answer 1

Check if the LED is on the wrong side or not.
Check that the relay has enough current to switch: apply power and ring with a multimeter if the normally open contact has been closed. Well, or at least the voltage on the bus at the moment the relay is closed, that it is about 9 V, and has not dipped below.

Answer 2

Contact stuck?
Z.Y. It is not clear from the picture which of the LEDs is yellow and which is red.
And yes, it's not a generator.