It sounds like you’re referring to the Fire Magic Lighted Master Shut-Off Switch (part number 24195-16), which is an illuminated on/off switch assembly designed for several Fire Magic appliances.
Compatible Models
According to your list, this part works with:
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Echelon Diamond Grills (2012–current)
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Echelon Diamond Side Cookers (2012–current)
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Aurora Grills (2014–current)
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Aurora Power Burners & Searing Stations (2014–current)
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Fire Magic Vent Hoods (pre-2015 models)
Function
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Acts as a main power shut-off for the grill or accessory.
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Lighted face allows you to easily see when power is on.
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Typically mounted on the control panel or nearby.
Part Notes
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Part number: 24195-16
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Usually comes as a complete assembly (switch + light + wiring pigtail).
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Designed to handle outdoor cooking environments.
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Direct replacement for the original part in the listed models.