Let me help you with your easter egg hunt...
to narrow down which circuit is causing the issue.. i took your picture and folded it in my mind.. added what is probably the proper circuit names..
you will want to photograph the connector from the top. .. then unplug it..
do you know how to depin the series 56 connectors used.. by pushing the wire and terminal inwards slightly while depressing the latching tab on the flat side of the terminal then pulling it out..
i attached my modification of your image..
the red wire at the top of your picture i labeled Tailight power into switch is probably the fused power circuit that blows.. but that is not the cause..
do you see the White wire i labeled instrument cluster. that probably goes to the instrument cluster.. in many OEM wiring setups.. that does not feed the cluster directly that feeds a 3 or 5 amp cluster fuse in the fuse box. then up to the cluster.. this prevents a dashboard short from taking out your tail and parking lights.
there are 3 wires above the white wire.. a dark blue i labeled tail or front parking..
and a pair of tan wires into one terminal.. also labeled tail or front parking.
its going to be one of these circuits that is causing your tail light fuse to burn out..
if you don't have a hand held digital volt meter... you may want one of these..
Digital Multimeter - Save on this AC/DC Digital Multimeter
you will want a pair of these also.
36 in. Low Voltage Test Leads so you can connect your test probes to ground without having to hold them. frees up at least one hand.
you can set it to 200 Ohms scale and measure each of the wires directly to ground.. this will tell you which one has the dead short..
post the results by wire color..
white...
blue..
tan pair..
the tail light filaments in 1157 bulbs are around 2.0 ohms ..
the Brake and turn filaments are around 0.5 ohms..
since you are working with the tail light circuit.. you are going to be working with the 2 ohms... now.. my brain does not work well in math.. with multiple 2.0 ohm bulbs in the circuit.. will there be only 2 ohms or will there be less.. they are in parallel.. so i would expect only 2 ohms.. this would be on the TAN pair of wires or the dark blue wire..
since i don't know what bulbs are used in your instrument cluster backlighting circuit.. i don't know what kind of resistance you are going to get and i don't have a single 194 or 168 bulb near me this morning to measure. expect over 2.0 ohms. on the white wire to ground.. if you have less.. you may have a short on that circuit..
please print this text so you can follow it under the dashboard..