Re: 1974 Z28 ?
Phil is correct. It's part of the seat belt interlock system. It's an override relay that allows you to start the car when there's a failure with the seat belt interlock system. There's a short paragraph in the 1974 service manual on how to use it.
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Mark
1966 L72, 4spd Caprice
1974 Z28, M40 Camaro
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