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Re: method of charging a 2004 Mercedes E320 battery
It is always safer to charge the battery out of circuit, Removal of one cable will insure you can safely charge without hurting electronics on board. Generally if your battery is already sufficiently charged it acts like a capacitor in the circuit and will prevent damage, but many battery chargers do not always put out a pure dc voltage and this can damage electonics.
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Not really sure if other modles got the same location.
Battery located under the Right Back Passenger seat.
for the seadan ... you may have to remove the back seat by pressing the corner bottoms in both sides then left it up and drag it to front to got it free... you will see the battery under it.
for the wagon... open the back right door and release the bottom seat by pressing the lock handle at the side of the seat up.... seat bottom will be cimi free to be lifted to front and then you will have free access to the battery.
if you just need to recharch the low battery... you can find the charging plugs under the hood to the left side ( +) will be covered with black plastic box... open it and connect the possitive cable (red)... ( - ) will be few inches front of that to be conected with nigative cable (black)
Battery chargers are wired into a boat's electrical system. Wiring the charger to a battery switch permits the charging of the individual batteries or battery banks. The switch can be configured to charge both batteries or battery banks at once. Mounting the charger in the vessel keeps the charger where it will do the most good--connected to the batteries. This is useful if you are stuck with low batteries and need a recharge. Power from a generator, shore power or even AC power from another vessel can be used to get you going again
Instructions Things You'll Need: Battery charger Battery switch Battery cable (sized) Cable cutters Razor knife Battery terminal lugs Lug crimper Terminal kit Terminal crimper Hammer Step 1 Mount the battery switch with the mounting kit provided by the manufacturer. The switch should be accessible but close to the battery or battery banks. Step 2 Mount the battery charger in a location that will be accessible but protected from the elements. Mount the charger close to the battery switch to reduce the size of the charger leads. Step 3 Connect the battery cables to the battery switch. Mount the battery cables onto their corresponding terminal studs on the battery switch. Step 4 Lay out the battery positive cable from the charger to the switch and cut it to length with the cable cutters. Strip 3/4 inch of insulation from the cable ends with a razor knife. Splice the cable to the hot wire from the charger with a **** connector and the terminal crimper. Crimp a terminal lug onto the battery end of the cable with the lug crimper and a hammer. Connect the terminal lug at the battery switch positive output terminal. Step 5 Lay out a battery cable from the charger to the battery negative terminal block. Cut the cable to length and strip 3/4 inch of insulation from the ends with a razor knife. Connect the battery negative cable to the charger negative power lead with a ****-splice and the terminal crimpers. Crimp a terminal lug onto the terminal block end of the cable with the lug crimper and a hammer. Connect the terminal lug at the battery negative terminal block post.
Tips & Warnings Set the switch to "1," "2" or "both" to charge battery bank 1, bank 2 or both batteries at once.
Use a battery tender 12 volts, or a similar type low current automatic charger, putting out about 1.25 amps or so and connect to the positive and negative terminals of the battery as directed. FIRST wear protective goggles or safety glasses and be sure the battery cells are adequately filled to the proper level with distiller water. Then connect the charger, plug it in and observe the lights for proper charging. It usually takes about 24hours to charge a battery sufficiently this way, but doing so will do it safely and without need to remove the battery from the vehicle. I charge my LR battery about every 4 months like this to keep it like new.
The auxiliary battery needs to be replaced. It's a smaller battery than the one you have in your trunk. If you take it to your dealer to have it checked out it will run around $300 to change, and on top of it they charged me $50 to diagnose the problem.
The 2 amp setting is a trickle charge, use this if you're going to let the battery charge overnight. The 6 amp is a little faster, anywhere from 4 to 8 hours depending on how low your battery is. Be careful not to overcharge if your charger does not have an automatic shutoff.
The E320 in that year range upto approx 2005 uses an auxiliary battery to operate the brake pump when main battery supply was lost or low. The low battery warning you describe can be caused by the aux battery being low. This battery is a small 7Ah battery mounted under the pollen filter in the engine area.