Fuse Blows on Bedroom Light Circuit

If the light in the bedroom only has the hot and negative going to it back up to the light in the cargo area and remove it. It's common to have wiring problems where the connections are made yes it could wear through somewhere and rub but it's common to have problems where they connect to the lights. If the cargo area light has doubled wires feeding it then you know that two of those wires are probably going on to the bedroom and the other two might be coming from the power or they're going to another light. Identify the light on the end of that run because that's the light that will only have one hot and one negative it's at the end of the string try to work your way backwards from there. Again it's more likely to have the insulator at the base of the bulb cracked or deteriorated or something shorted in the light area. Figure out how many lights you have on that string