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Answered 2015-07-15 19:10:49

A loose wire in the circuit somewhere; a faulty circuit breaker; faulty receptacles/luminaries.

The problem could be due to corrosion of the insulation of old wiring (not UF cable type used long ago) going to the garage. This happened to my garage that was built approximately 60 years ago. Suggest tracing the wiring with an ohm meter or continuity tester from the source to the garage to see if the line is open or close.

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