Led's always illuminated (green) when in closed state, when cam moves green led extinguishes and changes to amber and then vice-versa to show the cams have moved off and rotated to the second position and made contact. So it is really only telling you that the micro-switch has seen the actuation and made contact. Nothing to say the plug is okay, otherwise it'll need a secondary circuit to show there is power there etc, is it worth it when the fault is always the vis unit? I think the vis indicators is enough on its own to show that the cam has actuated in both positions which tells you the switch is working in both conditions.
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