Starting issue
Thread Starter
Newbie
Joined: Jan 2024
Posts: 2
Likes: 0
From: Queens New York
2015 s550 4 matic
Starting issue
Hello all, I am a new member here and am looking for some help. I recently purchased a 2015 S550 4matic and I’m having a starting issue. When you go to start the car it has a weak start. After driving either short or longer period it will turn over but not start. The sign it shows are of a dead battery. After trying to start 2-3 times it will not turn over at all. I connect a jump pack to the front under the hood terminals and the car starts up. I went to a MB dealer and bought both the H9 battery and the auxiliary battery and replaced them. I went to start the car and still it has a weak start. Not sure if it can be the starter being that it starts with the jump pack. Has anyone encountered the same issue?
Member
Joined: Jun 2022
Posts: 224
Likes: 121
From: Southwest Florida
2019 S560 4MATIC Sedan
Sounds like a bad connection at the main battery terminals. Was there any corrosion at the terminals? Where they cleaned properly before being reinstalled? Is the new battery fully charged? Mine came half charged.
My Aux battery had bad corrosion at one of the terminals when I replaced mine.
My Aux battery had bad corrosion at one of the terminals when I replaced mine.
Last edited by MBGuy2022; Jan 20, 2024 at 11:43 AM.
Thread Starter
Newbie
Joined: Jan 2024
Posts: 2
Likes: 0
From: Queens New York
2015 s550 4 matic
Sounds like a bad connection at the main battery terminals. Was there any corrosion at the terminals? Where they cleaned properly before being reinstalled? Is the new battery fully charged? Mine came half charged.
My Aux battery had bad corrosion at one of the terminals when I replaced mine.
My Aux battery had bad corrosion at one of the terminals when I replaced mine.
Senior Member
Joined: Apr 2023
Posts: 480
Likes: 305
2014 S63 2010 ML350 Bluetec 2009 SL550
Invest in a good battery changer so you can get both up to 100% before you replace anything else. Having a good charger is something you will always be glad you have on the shelf.
