If I can remember my aircraft training many years ago all metals are prone to electrical potential corrosion when two metals are in contact with each other. Thats what is happening in connectors, so when the connector is taken apart then back together again its sometimes enough to just remove surface corrosion and fix the problem without you knowing what you have done.
Just had this on my lads SP1 sidelight was,nt working but bulb was ok. I took the front fairing off to fix something else undid the connectors and when it was reassembled the bulb magically lit up.
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