Bela,
often water enters the battery box area at the rear of the central bonnet hinge.
On the later production 400's there is a small square catch area for this water just below the rear bonnet hinge bracket and a steel drain tube that is attached on the inside of the firewall , then down to the road . Sometimes this tube becomes blocked and the water overflows into the battery box area .
Early production cars don't have this drain tube .
Pls advise the chassis number of your car and post a photo of the this area of the firewall.
Geoff
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