IS has various meanings in the Replacement category. Discover the full forms, definitions, and usage contexts of IS in Replacement.
A switch that is generally operated with a key that closes and opens an electrical current to connect and disconnects the ignition system from the battery so that the engine can be started and stopped as desired. The key should not be removable when the engine is running. It usually has various positions which, besides starting the engine, allow the user to operate the accessories without engaging the engine or to check the bulbs in the warning lights on the dashboard .
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