Mercedes-Benz W140 flat battery and jump-start power
300 SS 500
W140: the battery is flat, is there a jump-start terminal in the engine bay?
There is no official jump-start terminal in the engine bay. According to the owner's manual the car also must not be tow-started. Opinions differ on where to feed in extra power, so it is worth confirming before connecting anything.
Where is the W140 battery located?
The W140 battery is not in the engine bay but in the trunk on the right side. That is why a flat battery can also prevent opening the trunk. After the battery is replaced, the engine bay relay fuses may blow.
What can drain a W140 battery overnight?
One possible cause is the trunk reading light, left on, which has drained the battery. Check the small lights and other power consumers first before suspecting a bigger fault.
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