Mercedes-Benz 420SEL Alternator Repair at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(19)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(19)

Alternator Repair Service

How much does a Alternator Repair cost?

On average, the cost for a Mercedes-Benz 420SEL Alternator Repair is $367 with $227 for parts and $140 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1990 Mercedes-Benz 420SELV8-4.2LService typeAlternator RepairEstimate$643.54Shop/Dealer Price$771.98 - $1143.11
1991 Mercedes-Benz 420SELV8-4.2LService typeAlternator RepairEstimate$634.53Shop/Dealer Price$759.87 - $1128.69
Show example Mercedes-Benz 420SEL Alternator Repair prices

How does an alternator help your car run?

The alternator is the component that charges the battery in your car. When you use electrical components in your car (stereo, lights, etc.), the battery loses power. The alternator recharges the battery, replenishing the lost battery power. The alternator is located in the engine compartment. If the alternator is not working properly, your car will only stay running for as long as the battery has power stored. Once the battery loses power, your car will not start. Normally, a malfunctioning alternator will turn on the battery warning light or will have a low volt gauge reading.

Alternator

Before repairing the alternator:

The mechanic should check the entire charging system before installing a new alternator, including checking battery cables for corrosion and the condition of the battery.

Steps when replacing an alternator:

  • Inspect entire charging system (battery, cables, alternator).
  • Inspect the drive belts.
  • Test alternator output.
  • Remove and replace alternator if found to be faulty.
  • Re-test alternator output.

Our recommendation for alternator replacements:

Ask your mechanic to inspect the condition of the charging system during every major service. The mechanic should also clean and tighten the battery cables during every major service.

What common symptoms indicate you may need to replace the Alternator?

  • Dead battery or battery will not hold a charge.
  • Dim lights.
  • Battery warning light is on.

Why repairing your alternator is important:

Your alternator charges your battery, which powers the electronics in your vehicle, such as the radio and the air conditioning. The battery is also needed to turn on your vehicle. A malfunctioning alternator will not charge your car’s battery, and your vehicle will eventually run out of battery life and not be able to start.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(19)

Rating Summary
18
0
0
1
0
18
0
0
1
0

Carlos

29 years of experience
601 reviews
Carlos
29 years of experience
Mercedes-Benz 420SEL V8-4.2L - Alternator Repair - Riverside, California
Carlos is chill dude; showed up early and helped me out in under an hour. He also gave me tips on how to become a mechanic. Honestly will book him again if anything happens.

David

33 years of experience
107 reviews
David
33 years of experience
Mercedes-Benz 420SEL V8-4.2L - Pre-purchase Car Inspection - Phoenix, Arizona
I felt comfortable with David working on my vehicle. I felt he was honest with me and will recommend his services, as well as, yourmechanics' services to friends and family.

Marco

30 years of experience
329 reviews
Marco
30 years of experience
Mercedes-Benz 420SEL V8-4.2L - Speedometer is not working - Riverside, California
Marcos was thorough and complete, was glad to have him check out my problem

Desmond

21 years of experience
55 reviews
Desmond
21 years of experience
Mercedes-Benz 420SEL V8-4.2L - Valve Cover Gasket - Salinas, California
Top-notch! Timely, competent, and thorough with the 50-point inspection. I got much more out of the 50-point inspection than the initial service request---definitely above and beyond!

Excellent Rating

(19)

Rating Summary
18
0
0
1
0
18
0
0
1
0
Number of Mercedes-Benz 420SEL services completed
209+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

How to Get Jeep Dealership Certified
Jeep car dealerships offer automotive technician jobs to mechanics who are Jeep certified through Chrysler’s official training program (MCAP)
How to Replace a Car Horn
A working horn is an important function for every car. The horn sounds as a safety feature and is required to pass most state inspections.
Windshield Laws in Alabama
When When it comes to driving a vehicle on Alabama roads, you already know there are many rules you have to follow. However, in addition to the rules of the road, you also have to make sure that the condition...

Idle speed too high

The idle speed may be elevated due a a large vacuum leak. When unmetered air has entered the engine, the vehicle may try to compensate by adding fuel. The extra air and fuel translate to an increased idle speed. Have...

Will replacing your O2 sensor stop your car from vibrating at a stop?

Hi there, thanks for writing in. The replacement of the O2 sensor might help reduce engine vibrations, but if you're feeling the shaking in the steering wheel (https://www.yourmechanic.com/services/car-is-shaking-or-vibrating-inspection) when you slow down, it's most likely contributed to damaged brakes, wheel...

Throttle Issues after cleaning it

The throttle body is not designed to be taken apart to be cleaned and you may have got cleaner into the sensors and actuator motor causing a short in the throttle body electrical parts. You need to have the computer...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com