Gold

84 totota sr5 22r short bed

old87yota

Which 7.5 amp fuse is blowing?

Does it blow immediately after replacing the blown fuse with a new one? If so, this would indicate a dead short in the wiring somewhere, or potentially in an electrical component.

Is there any backstory to the fuse blowing?

Just a friendly reminder: do not install a higher amperage fuse than what is specified!

slow-mo

Ditto on this.

When a fuse blows, it is because the power wire, the wire carrying 12 volt current, is finding ground (or earth as it is also called) before the load, i.e. a bulb.

There are commercially made short finders available, but one can also fabricate a tool that has flat-blade electrical connector that fits into the position of the fuse. Then you would wire (solder) in a in-line fuse and either a light bulb or buzzer in series. From there, on the circuit component it powers, you can move the wire(s) around, and if the light bulb lights up or the buzzer sounds, you are in the vicinity of the short. The light bulb or the buzzer now becomes the load and will not blow the fuse. From there you would have to dig into the wires themselves or just look to see if any wires have lost the insulation and are finding a path to ground.

RAD4Runner

Ditto on above, and pls see signature.