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I wish to install two LED Auxiliary Fog lamps of 27w each (54 w in total), for my motorbike powered through a 12V Battery. What type (capacity) of relay should be used for this. Kindly let me know.

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54 watts at 12v equates to 4.5A. That's not a lot. Any 20A automotive relay will the job. You can get both the relay and socket for the relay at almost any parts store. Here's what a 4-post looks like:

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