I would verify with a meter but from my experiences the "illuminated 12vdc switches" typically have positive in, positive out, and a ground to connected to the indicator light. That ground wire should still be "safed off" with a wire nut and tape or a closed end crimp connector and tape to prevent a problem if there were an exposed terminal below.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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