I agree with Roger, turn them on one at a time to see what comes on. If nothing then it’s either a spare accessory switch or you’ll need to dig in further. You may need to start by verifying power to the switch then document the wire color on it which should help us provide a better guess on where it goes.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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