Just to the right of your headlight switch , on your dash , is a dimmer wheel switch. I know when that is rotated all the way up it turns on the courtesy light when the doors are closed - check to see if it also turns on the cargo light
On a 1998 Ford Ranger : Try rotating the gauge panel dimmer switch all the way up , I BELIEVE that turns on the interior courtesy lights and the cargo light * in your dash , just to the right of the headlight switch *
On a 2001 Ford Ranger : Rotate your gauge panel dimmer control all the way UP ( that turns on the interior courtesy lights and the cargo lights ) * located in your dash next to the headlight switch
I believe the light for the cargo area is turned on with the interior courtesy lights by rotating your gauge lighting dimmer wheel switch all the way UP ( The switch is located just to the right of the headlight switch )
I believe that you turn your gauge panel dimmer switch all the way up ( located in your dash just to the right of the headlight switch ) and that turns on all your courtesy lights including the cargo light
Just to the right of your headlight switch on your dash is a gauge panel dimmer wheel switch , when that is rotated all the way up it turns on the courtesy lights , and I believe that will also turn on the cargo lights
I believe the cargo lamp turns on when you rotate the gauge lighting dimmer wheel all the way up to turn on the inside courtesy lights . The dimmer wheel is on your dash just to the right of your headlight switch
Do you have a gauge lighting dimmer wheel switch to the right of your headlight switch ? Maybe it's been rotated all the way up , I believe that will keep your dome and cargo lights on
Try turning headlight dash dimmer rheostat to extreme end
Turn your interior light dimmer until it turns on the cabin lights.
It is on the same dial as the dashboard lights. Turn it all the way up until you hear/feel it click.
If all the running lights (front & back) are not working I'd start by checking the fuses then onto the headlight switch
I believe when you turn the gauge panel dimmer switch ( to the right of your headlight switch ) all the way up the cargo light also comes on with your interior courtesy lights