Could be bad ground wire or broken ground wire.Test with continuity tester.
Contact where the bulbs go in generally corrode, can be cleaned with Emery paper,or may need to be replaced, you can do so without buying the complete lamp.
Check the sockets and wiring
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Could be bad ground wire or broken ground wire.Test with continuity tester.
Contact where the bulbs go in generally corrode, can be cleaned with Emery paper,or may need to be replaced, you can do so without buying the complete lamp.
Check the sockets and wiring