I was thinking the same thing, but the battery is just over a year old, 14 months to be exact. Do you think my festoon bulbs could be a problem? The license plate bulbs, glove box bulbs, and interior lights are the ones shaped like bullets. I got a good deal on some, but didn't realize that they were 24v instead of 12v. this is a recent change. Any issue with running the 24v bulbs in a 12 v system?

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1990 190E 3.0L