The galvanised strip in those lights is pretty crude as well. As above, a good clean, contact cleaner spray and don't forget to emery the bulb contacts too and it should be fine. They are prone to water ingress too. Our rear lights have a tiny hole drilled in the external surface to allow rainwater to drain out, otherwise the light is filtered through a pool of water.
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"The more people I meet the more I like my God."
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