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1354 Views 2 Replies 3 Participants Last post by  lippens
Doing some research on changing the batteries out on my 2004 E500.

1 – Is it worth taking to dealer to just get batteries changed out?
2 – looking for DIY battery changes…any tips?

My battery light comes on and tells me to take to shop, I'm thinking I will need to change out the batteries?
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If you're battery light comes up, it might be that your alternator is failed. You would then have 20 minutes or so worth of electrical lifetime. Hurry to a workshop, or check the charging voltage:

Turn the key to position 1
Set the instrument cluster to the odometer menu
Press the reset button briefly 3 times
The voltage will be displayed
Start the engine

Make sure you read 13.0V or plus. If you do, then the alternator is fine. If you're reading below 12V, then you have minutes worth of driving time since you're running on the battery.
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