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HI my name is Robert...
IF you have an interior switch then you have to have a solenoid for the switch, when you hit the switch is energizes the solenoid and allows power to the chassis fuse box. Sometimes when you hit the switch you can hear the solenoid click each time, if you can not locate it by sound follow the chassis battery cable and it will go right to the solenoid, once you locate the solenoid check for power on the LARGE posts of the solenoid. IF you have power on one side and not the other jump the solenoid and see if your power comes on, normally that solenoid is located outside and can be in a battery control box with other fuses, breakers and solenoids. IF you jump power you have power then the solenoid most likely is at fault. Also when you are following the cable look for a tripped breaker, below is a picture, most have a small tab that pops out when they trip, you also might have more then one so if you see any you should have voltage on both posts... Hope this helps some..... Robert