Help: 1994 Toyota land Cruiser: left turn signal works but when I turn the right turn signal on it blows the 7.5 amp fuse disabling the turn signals.

Hi Steven
Do the simple stuff first. Check the obvious points at which the circuit may get shorted. Light Bulbs and sockets. Wires in the boot or rear lamp area. Down the steering column. Follow harness to front then rear. Age of vehicle and how it's used may provide clues. Trailer Connector Wires & Connections to harness.
(Where could they Link Together)
If that fails
You need to isolate each circuit that is blowing a fuse and trace the fault to a location. Probably when you find the fault (ground short or wires shorted together) it will become obvious that the two separate circuits are linked.
So... start with the right turn signal

Finding Shorts It's a pain.... but.... here's the process!
Remove the Fuses that keep blowing.
Make up a long lead from the battery positive terminal.
Say 4 meters.
Add a cheap 5A or 10A circuit breaker in the lead wire.
Make a probe tip on the end of wire. (needle, pin. nail)
This saves you going through many fuses.
The circuit breaker simply resets when it cools.
The best way to locate the short is to Note the wire colour code (or use iPhone to take photo).
Supply power via the made up jumper & circuit breaker to the suspect circuit wire to prove that it blows the circuit breaker.
Then.... split the circuit in two...
Half way down the vehicle (say front door step) Lift the plastic trim off and find those colour coded wires.
Prove these are the wires by pushing sharp probe through the insulation. Circuit breaker blows....
Cut the wires. Try Rear wires vs Front wires and Determine if the short is in the Front section or the Rear section.
Then use the same process over again on the section which is faulty (shorting) Divide in two. until you narrow the short location down.
Keep in mind that the short could suddenly disapear if you get close & simply move the section with the bare (shorted) wire which touches the chassis or another wire.
Slip some heat shrink tubing over these cut wires and resolder them later. This is better than crimp terminals which may cause problems later.
Good Luck

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Power Probe PP3LS01 Power Probe III Circuit Tester Kit with Lead Set Red...