Q: Can a blown bulb cause a short in the circuit resulting in a drained battery overnight ? Mercedes Benz

asked by on February 12, 2017

Overnight my battery will be completely drained and I'm wondering if a blown license plate light can cause the circuit to short and draw current while the car is off

Electric Problems Inspection $79.99 - $89.99 Get a Quote

Hello - no, I don’t think it’s possible for a light bulb to cause a dead battery unless it’s left on overnight. Something else is going on here that’s draining your battery. This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. The specific components on that circuit can then be checked for current drain problems. A professional mechanic, like YourMechanic, can come to your location, and perform this procedure for you, and replace/repair the failing component.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Engine turns but won't start - 2001 Mercedes-Benz ML430

Hello and thank you for your question. Check for the three essentials that the engine needs to run. Check for air in the engine and make sure that the air filter is not plugged up. Check for spark to the...

Car cranks but won't start - 2007 Mercedez-Benz E350

Hello. There are quite a few things that can cause this. It appears that you have already changed quite a few parts trying to overcome this problem. From what you are explaining, this is almost always fuel related. I have...

The air conditioning, heater, and defroster are not working.

The symptoms you are experiencing can be caused by a few different things. If you are hearing a gurgling noise and your heater is not providing heat, then I would check the engine's coolant. If the coolant is low, it...

I replace my crank shaft sensor, but it still not working and I've checked the connector. I think it has no power or ground. How do I fix it?

Hello. It sounds like you are saying that the car is starting but dying when you try to pull away. If the car is starting and idling, then the crank position sensor is probably alright. Usually a malfunctioning sensor results...

Secondary air pump.

The air pump supplies the catalytic converter with extra oxygen so that it can efficiently catalyze any unburned fuel. On start up, the catalytic converter is cold and requires some help to quickly get up to temperature allowing it to...

Oil Pressure hot engine - 1979 Mercedes-Benz 240D

Hello. Engine timing and the oil pump work hand in hand. If the timing of the engine is off, then the oil pump won’t work as it should and this will cause low oil pressure. The first thing to do...

car shaking/vibrating when idle

Hello. This sounds like potentially a failing idle air control valve or potentially a misfire. The idle air control valve regulates the air intake into the engine as it is mixed with fuel prior to being injected into the engine....

Cold weather starting problem

As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your car in the morning and turn the key to on, the coolant temperature sensor immediately...

Coolant thermostat sensor 2008 c300 benz

Your temperature sensor is going to be located behind the engine on the driver side. You will need to remove the engine cover and you will need a torx bit (30) to remove the sensor. You can find the info...

Related articles

How to Check Your Car Brake Lights
Car brake lights are essential for driving safely. Check the brake lights and brake fuses regularly to keep the brake system working well.
Industry News for Automotive Techs: October 22-28
Japanese automakers step up security, Mercedes' X-Class pickup, carsharing with Turo, VW TDI settlement approved, Faraday Future behind on payments.
Ten Sports Cars That Double as Good Daily Drivers
The best daily driver is a car that's reliable, usable, and still fun to drive. Popular daily sports cars include the BMW M3, Subaru WRX, and VW GTI.