It’s not such a simple on-off switch:
Stripping down the gear lever you can see it is quite a complex affair.
There is actually a solenoid which locks the gear in the down position until the aircraft is in the air. Surprisingly the gear locked in place when I moved it to the down position with no power supplied.
Back to the drawing board to see how to activate the solenoid, and to get the bulbs functioning.
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