How to seal tail lights from water?

[WoGGo]

I washed my car the other day and noticed some water is getting through the tail lights, and subsequently into the battery tray.

Without looking I would imagine the Lens Seal has perished, but will getting a new one solve the problem, or should I be looking at other alternatives like Butyl Sealant Rope/Tape?

[Slideways]

Yes, a new one will stop water getting into the trunk area; otherwise, the bootlid seal can also let water in if it has worn out.

[Wernd]

There's also a plastic guard with a seal you may want to replace. It snaps into the light and runs verticle

[WoGGo]

There's also a plastic guard with a seal you may want to replace. It snaps into the light and runs verticle

Do you have a link or picture of this?

[Bogart79]

Do you have a link or picture of this?

This seal is what you see when you open the trunk.

https://www.fcpeuro.com/products/bmw-covering-right-63216933018

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[Albino09]

This seal is what you see when you open the trunk.

https://www.fcpeuro.com/products/bmw-covering-right-63216933018

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I put some used amber taillights on my car without replacing these, and immediately had a water leak issue into my trunk and battery tray. After replacing these pieces, I haven't had an issue since. I did not have to replace the foam circles around the bulbs, though it wouldn't hurt to be sure. These plastic covers help direct a lot of water coming down from the trunk seams as it leaks down towards the ground.

[Wernd]

The plastic seals show above keep out all water that comes off of the roof and back window. The foam seals behind the light help keep out water that gets in around the light housing. Both are relatively inexpensive and easy to replace so why not

[LSBNick]

The plastic seals show above keep out all water that comes off of the roof and back window. The foam seals behind the light help keep out water that gets in around the light housing. Both are relatively inexpensive and easy to replace so why not

This. Have done this process for about 3 different cars. Well worth it for the peace of mind.

[WoGGo]

Will definitely be doing both...

[SheilaB777]

Hello, How do you seal the black plastic pieces for water for new tail lights? There is approximately 1/4" gap on the top left side and I've ordered new plastic pieces and tail light gaskets. 2003 BMW M3 Manufacturer date 06/03

[bagger]

The new seals should help close that up. I just did mine. It's a hard plastic piece with a rubber (?) gasket kinda thing around it. Take the light out, snap it in, put the light back in and you should be good to go.