Hey everyone, just wanted to add an item to be checked in the long list of items when finding a trunk leak. This could be a very possible location if you find a pool of standing water in the car jack location or under the battery tray. The rear side marker light has the wiring going through a body grommet. This grommet is the cause of water coming in. They are both very badly cracked and on the driver side it is so wide you can see light through it. Granted that this area is behind the rear bumper but water can find any opening real easy. The bad news, is that even with a proper BMW part number, no one can obtain them, not even the dealer. The only open besides finding a used one, modern 5 and6 series use them, is to buy the e30 m3 rear markers as they come with the grommet. But the lights are over $65 each. When I paint my car, I might go this route and then throw away the actual wiring. The lenses should work or I can resell them to a e30 m3 owner. I will have to cut my wiring and solder it back but a small price to pay to keep a dry trunk. Right now I just fill in the cavity of the grommet with RTV.
Hope this helps others.
Here is a pic of the rear exposing on of these grommet's and you can see how mine is all loose.
Hope this helps others.
Here is a pic of the rear exposing on of these grommet's and you can see how mine is all loose.
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