Unless a previous owner has replaced it, I believe you have a Shur-Flo 4008 RV Revolution pump. The standard switch that comes with that unit has two electrical connections on the back of it, one coming from the 12 VDC supply, the other going to the pump. In order for the switch to have a pilot light, it would need 3 connections, with the third one providing a ground connection for the light. If you don't have a third connection, there is no light.
Can you stick your head into the cabinet and look at the back of the switch? Are there two wires or three connected to the switch? A photo would help.
Bill
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