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The pic doesn't show up for me, but I have an aftermarket relay activated by the brake light that goes to the radio that I think is to reduce interference.
I'm sure someone with far superior knowledge than mine will be along soon to provide a better answer...
My 75 has the same thing connected to the turn signal wires. It is a capacitor or filter for radio interference. From my research this seems to be a dealer installed fix and also it was installed in different places.