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It is probably for a light. Connect a test light to the battery + and to the L terminal, the light should go on. Start the engine and the light should go off. If that works then wire a small light from a switched source and to the L terminal and you will have a charge indicator light.
It is probably for a light. Connect a test light to the battery + and to the L terminal, the light should go on. Start the engine and the light should go off. If that works then wire a small light from a switched source and to the L terminal and you will have a charge indicator light.