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First, check to make sure your trunk seal is in good condition. It is looks okay, you might have a bad rain rail. The rain rail is the piece that connects your soft top to the back of your car. You can check it by pulling back the carpet on your deck lid. You will see that the rain rail is attached around the top of the deck lid with a series of bolts. Have someone pour water on the back of your top while looking at the rain rail where it attaches. If it leaks, there is your problem. A bad rain rail can cause water to leak into the trunk and also onto the deck lid. You may also find water from the deck lid flowing down to the foot well areas.

Another possible is your battery sweating. If your Miata Battery is in the process of dying it sweats - quite a lot. I replaced my trunk seal for $70.00 first, still had lots of water in my trunk. Finally my battery died, I replaced it and the water stopped!

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Q: Why is there water in the trunk of your 1990 Mazda Miata MX5 after it rains?
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