Mr. Pinball Tip:

A 9-volt battery is also useful for testing relay coils. The spacing of the coil lugs are about the same as the battery terminals. Just press the battery up against the relay coil lugs. A few coils will close on their own, but most will need to be closed by hand for testing. All will hold with the 9-volt current and removing the battery will release the relay. If the coil doesn't hold then you know that you have a bad relay coil.
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