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The relay switch itself does not directly spark the fuses for the radio and heater; rather, it acts as a control mechanism that allows current to flow to these components when activated. If either the radio or heater is drawing too much current, it could potentially blow a fuse, but this is a separate issue from the relay switch's function. Proper functioning of the relay ensures that the components receive power without causing a short circuit or overload. Always check the relay and fuses if there are issues with the radio or heater operation.
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