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      07-25-2013, 05:56 PM   #4
alexwhittemore
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Drives: 2009 Crimson 328i
Join Date: Oct 2012
Location: Los Angeles

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Yep! And actually, they don't really make it clear, but orientation of the tap sort of always matters: if you have the tap in backwards, current for the accessory flows first through the original accessory fuse (bottom of the tap) THEN through the new accessory fuse, then out the wire. It's easy enough to get right: the bus side of the fuse tap is opposite the wire (so current flows through the top fuse), and the bus side in the fuse holder will be powered, while the accessory side won't be. In the BMW fuse box, where fuses are ganged up in two rows, the bus side is the outside of the row and the accessory side is inside. Note above, the outside of the CD changer is connected to the inside of the lighter socket fuse.