![]() ![]() Low Water: Some batteries have fill holes that allow you to maintain them, although most modern batteries are maintenance free and don’t allow you to add water. Batteries most commonly “die” during hot and cold weather. Have your battery tested every Spring and Fall to ensure that you’re able to avoid being stranded by a failed battery. This is part of normal vehicle maintenance. They will develop a bad cell that prevents them from holding a charge and will need to be replaced. If your battery won’t hold a charge, it means there are problems within the system that are either preventing the battery from being recharged, or draining the battery when the engine is off.īad Cell: Batteries will eventually die no matter what. Of course, automotive batteries have a limited lifespan – they should be checked regularly after they’re about three years of age (although it’s wise to have them checked at least twice a year no matter how new they might be). If it does not, then the electricity needed comes from the battery and because it’s not being recharged, it will eventually die. The alternator should always provide enough electricity to recharge the battery and power your other components. Once the engine is cranked, the alternator begins turning, which generates the electricity necessary to recharge the battery and to power the engine and other components. The battery also supplies the initial electric spark to the spark plugs. The main relay powers the fuel pump and computer. In a normal system, it works like this: Your battery supplies power to the starter and the main relay. A battery light may appear in the instrument cluster otherwise.Service type Battery will not hold a charge Inspection Once the systems battery has been replaced you can reconnect the starter battery. Therefore, if you are replacing the systems battery (in the trunk) you need to disconnect the negative battery cable from the starter battery (under the hood). On vehicles with two batteries (starter battery and systems battery), usually S-class (221) and SL class (230/231) the starter battery needs to be connected first.This is where the systems battery will be located. Once the bolts are removed and the bottom panel comes out, the forward most panel will pivot out from the left side (right side pivoting) and slide out to reveal a space between the forward-most trunk panel and the back of the seat. The trunk bottom panel has two T20 Torx bolts that sit inside the black plastic hooks bolted to the floor of the trunk. On the S-Class or AMG S-class (2010 or later) there is a panel at the forward most part of the trunk that can easily come out with the removal of the trunk bottom panel. In some cases, there is a strap wrapped around the battery that can be loosened by finding the buckle, usually located on the side of the battery. On vehicles with the battery in the trunk, you need to lift up the trunk floor panel and the battery should be on the right or center of the trunk under compartment.Although some batteries may seem shoehorned into their respective place, push all cables and wires to the side and lift straight up. use a screwdriver and pop them upward and removed air filter box. There are three snap clips on top that hold it to the firewall. Additionally you may need to remove the cabin air filter box. A 13mm socket and extension are required to remove battery bottom mounts. On vehicles with exposed batteries (under the hood), a 10mm wrench or socket is required to remove battery cables and battery top mounts. ![]()
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