Rear lights
First off ,Has the car ever had a trailer hitch installed ? If so Delete all wireing going to it .Then unplug wireing harness in LH side of trunk Long black plug see if it still blows fuses .If so follow the harness under carpet & door sill this harness has aluminium wires in it ,It goes all tht way to fuse box. very bad about corrodeing & shorting out .Thats pretty much all your rear wirieng .From there its TS switch Good Luck
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