SL/R230: Replacing new starter Battery
Thread Starter
Newbie
Joined: Aug 2025
Posts: 10
Likes: 0
2003 sl500
Replacing new starter Battery
Hi All,
Does anyone know if I replace my starter battery with a new MB battery on a 2003 sl500 do I need to disconnect the consumer battert first and after I install the new started battery reconnect the consumer battery?
Does anyone know if I replace my starter battery with a new MB battery on a 2003 sl500 do I need to disconnect the consumer battert first and after I install the new started battery reconnect the consumer battery?
Junior Member
Joined: Aug 2025
Posts: 25
Likes: 1
From: College Station, TX
2004 Mercedes Benz SL500
mv892727, I have attached two pages out of the service manual. The page labeled "File No.1" seems to have the instructions you need. However, I also included "File #2" for the AMG Black Series, which to me doesn't seem to apply to an '04 SL500s. Could be wrong. Use at you own risk.
Thread Starter
Newbie
Joined: Aug 2025
Posts: 10
Likes: 0
2003 sl500
mv892727, I have attached two pages out of the service manual. The page labeled "File No.1" seems to have the instructions you need. However, I also included "File #2" for the AMG Black Series, which to me doesn't seem to apply to an '04 SL500s. Could be wrong. Use at you own risk.
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Member
Joined: Mar 2020
Posts: 76
Likes: 14
From: Far NW Phoenix area
2003 SL55 AMG
I have replaced the front battery twice in the last 3 years without disconnecting the consumer battery. When I was ready to do the install, I made sure all equipment was off, closed the doors and trunk, and stayed away from the door handles. I then disconnected the ground, then the power cable, switched batteries, then connected power and then the ground cable. No problems. I believe that this is fine in my 2003 SL55 as long as circuits are not switching.
Super Member
Joined: Sep 2021
Posts: 534
Likes: 115
From: Ann Arbor, MI
2004 SL600
I have also several times disconnected the starter battery without first disconnecting the consumer battery. As mentioned, if everything is off, it likely won't cause problems. However if you connect the consumer battery when the starter is not connected, you will get a warning and perhaps a sticky code. I don't remember if the warning/code goes away after a few starts or you need a scanner to reset the code.
