The redneck in me would be inclined to introduce a switch on that circuit before the fuse, to shut off the power to that circuit when it's not in use...locate it below the dash, or in the console.
Don't laugh...you wouldn't need to spend hours searching for the issue, and have a simple way to shut it off and save your battery.
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 1987 560SL
85,000 miles
Meet on the level, leave on the square. Great words to live by
Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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