R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

08 R350 Red Battery Screen/Not Starting

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Old 06-11-2022, 08:11 PM
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'08 R350
08 R350 Red Battery Screen/Not Starting

I've recently bought a 2008 R350.
After driving it for about 3 weeks, it rained. Well to my surprise, vehicles have gutters? So, the drain box under the hood was clogged and overflowed into the passenger floorboard. That being said, my battery compartment flooded but the water didn't reach the battery terminals nor the fuses in the box.
Since then, the red battery screen has come up on the dash, the car will not start and the back windows went down on their own and will not come back up.
We've completely dried everything out, replaced the battery and the fuse box in the battery compartment, cleaned some corrosion off of the auxiliary battery, checked all of the fuses.

Also, the battery is draining instantly. Both the old battery and the new battery.

Can someone please tell me what the problem could be??

Last edited by Scook95; 06-11-2022 at 08:14 PM.
Old 06-12-2022, 02:33 AM
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2006 R500
Check every underfloor compartment for water. Something is shorting and draining your battery. There are computers that are down there.
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