How a Battery Works With a Car's Electrical System

Schedule Brake Pad Replacement
Service Area

$124.62 - $450.29

Price range for all vehicles
Average rating from 10,887 customers who received a Brake Pads Replacement.

Have you ever wondered how your car’s electrical system works? It all starts with your car battery.

Your car's electrical system operates on a closed circuit, with the main power system being the automotive battery. It uses less than the typical household current, and yet still manages to operate all the functions of your vehicle, including your headlights, window defoggers, turn indicators, aerial, fan, heater, washer pump, locks, sensors, and gauges, and more.

About your automotive battery

All that electricity flows along one cable running from your battery to the component that it powers, and then back to the battery through the metal body of your car. This is called a negative earth return system. That, essentially, is how car batteries work to make your car electrical system function.

What happens if your car battery voltage drops?

If the voltage drops, then your car's electrical system doesn’t work properly. You might find that your windshield wipers are sluggish, your windows don’t go up and down as quickly as they should, or even that your car is reluctant to start when you turn the key. That’s because some components will only work if they’re getting a high enough voltage.

The starter motor

Your battery also delivers electricity via a heavy cable to the starter motor. The starter is what activates your spark plugs, powers the alternator, and delivers power back to the battery.

This is a pretty simplistic explanation of how car batteries work with your car’s electrical system. The fact is that this is far too complex a topic to deal with in the space of this brief article. Modern cars can contain literally miles of wiring in the car electrical system, and this isn’t really a topic for a backyard mechanic, although it is a good introduction for someone who is curious about how car batteries work in the context of the whole vehicle.


Next Step

Schedule Brake Pad Replacement

The most popular service booked by readers of this article is Brake Pad Replacement. Yourmechanic’s technicians bring the dealership to you by performing this job at your home or office 7 days a week between 7AM-9PM. We currently cover over 10k cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

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

Recent Brake Pad Replacement reviews

Excellent Rating


YourMechanic Brake Pad Replacement Service

Average Rating

4.9/5

Number of Reviews

10,887

Rating Summary
10,377
326
67
33
84
10,377
326
67
33
84

Eladio

8 years of experience
128 reviews
Eladio
8 years of experience
Honda Civic - Brake Pads Replacement (Rear) - Greensboro, North Carolina
Eladio arrived at the scheduled time and was great to work with. He was very professional and I am very satisfied with his work. This was my first time using YourMechanic and I am very pleased with how easy and convenient this service has been from start to finish. Definitely would recommend.
Nissan Altima - Brake Pads Replacement (Front) - Greensboro, North Carolina
Eladio was on time, expedient, and very professional. Very pleased with provided service (brake shoes replacement).

Chris

13 years of experience
107 reviews
Chris
13 years of experience
Hyundai Sonata - Brake Pads Replacement (Front, Rear) - Port Richey, Florida
CHRIS IS THE BEST MECHANIC I HAVE EVER MEET IN MY LIFE. HE IS HONEST AND HE KNOWS HIS STUFF. VERY PROFESSIONAL AND KNOWLEDGEABLE. THANK YOU CHRIS!!!

Pardeep

19 years of experience
587 reviews
Pardeep
19 years of experience
Dodge Caravan - Brake Pads Replacement (Rear) - Fremont, California
Pradeep was early to my appointment and during his work he showed me that I didn’t need rear brake shoes saving me money.He cleaned and serviced the existing shoes and he also adjusted my parking brake cable. Great job. I will always use Your mechanic for any car repairs.

Oreste

12 years of experience
117 reviews
Oreste
12 years of experience
Dodge Avenger - Brake Pads Replacement (Front) - Miami, Florida
Orestes is very professional. He explained what was done to my vehicle and suggested upcoming maintenance needed. Great person

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE