How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Jerry Your Own Question

Jerry
Jerry, Master Mechanic
Category: Chrysler
Satisfied Customers: 13017
Experience:  ASE Master tech. 30+ years mechanic, shop forman, service manager
Type Your Chrysler Question Here...
Jerry is online now
A new question is answered every 9 seconds

Battery light come on after replacing the alternator with a new one?

Customer Question

Why does my battery light come on after replacing the alternator with a new one?
Submitted: 5 years ago.
Category: Chrysler
Expert:  Jerry replied 5 years ago.

Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.

 

What is the year make and model of it?

 

Customer: replied 5 years ago.
2006 chrysler sebring touring convertible 2.7 v6
Expert:  Jerry replied 5 years ago.

You will want to be sure that there is power at the alternator at all times, (big red wire)

 

Unfortunatly the voltage regulator is built into the PCM, (powertrain control module) and if the fuse links are good, (power at the alternator) then the PCM would be the most likely problem. Or the alternator could be bad. You will want to test the charging system.

 

 

 

graphic

 

 

Of course, you will want to make sure that the alternator is grounded well also.

 

Description and Operation
Notes

The Electronic Voltage Regulator (EVR) is not a separate component. It is actually a voltage regulating circuit located within the Powertrain Control Module (PCM). The EVR is not serviced separately. If replacement is necessary, the PCM must be replaced.

The amount of DC current produced by the generator is controlled by EVR circuitry contained within the PCM. This circuitry is connected in series with the generators second rotor field terminal and its ground.

 

Customer: replied 5 years ago.
The alternator is brand new (chrysler manufactured....) They ran diagnostics and said that the alternator wasn't putting out enough juice and that it needed to be factory..... so they switched it out.......
Expert:  Jerry replied 5 years ago.

Was the battery light on before the alternator was replaced?

 

Do you know that it is charging?

Customer: replied 5 years ago.
The battery light was on before the alternator was changed. The car shop that was working on it put a rebuilt alt. in, but it didn't fix the problem so they sent it to the dealership to get it diagnosed, that is when the dealership said that it needed a factory alt. for it to get enough amps.... so the car place replaced the alternator with a factory one.... the light went off for a few minutes to half an hour, then came back on..... I have know personal idea whether it is charging correctly or not... it seems that I am missing some interior lighting, but the car starts up and runs fine.... thought about replacing the battery and checking the battery connections.... other than that I am at a lost with the exception of the computer nodes that communicate between the parts and the boards.... I will check back in the morning for a reply.
Expert:  Jerry replied 5 years ago.

It sounds like someone is not diagnosing it correctly. Or there is a problem with the PCM.

 

 

 

Testing and Inspection
Notes

ON-BOARD DIAGNOSTIC SYSTEM
The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging system, making sure they are operational. A Diagnostic Trouble Code (DTC) is assigned to each input and output circuit monitored by the OBD system. Some circuits are checked continuously and some are checked only under certain conditions.

If the OBD system senses that a monitored circuit is bad, it will put a DTC into electronic memory. The DTC will stay in electronic memory as long as the circuit continues to be bad. The PCM is programmed to clear the memory after 40 good trip if the problem does not occur again.

DIAGNOSTIC TROUBLE CODES
A DTC description can be read using the DRBIII(R) scan tool.

A DTC does not identify which component in a circuit is bad. Thus, a DTC should be treated as a symptom, not as the cause for the problem. In some cases, because of the design of the diagnostic test procedure, a DTC can be the reason for another DTC to be set. Therefore, it is important that the test procedures be followed in sequence, to understand what caused a DTC to be set.

ERASING DIAGNOSTIC TROUBLE CODES
The DRBIII(R) Scan Tool must be used to erase a DTC.

The following procedures may be used to diagnose the charging system if:

  • the check gauges lamp or battery lamp is illuminated with the engine running
  • the voltmeter (if equipped) does not register properly
  • an undercharged or overcharged battery condition occurs.

Remember that an undercharged battery is often caused by:

  • accessories being left on with the engine not running
  • a faulty or improperly adjusted switch that allows a lamp to stay on.
  • loose generation belt.

INSPECTION
The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging system, making sure they are operational. A Diagnostic Trouble Code (DTC) is assigned to each input and output circuit monitored by the On-Board Diagnostic (OBD) system. Some charging system circuits are checked continuously, and some are checked only under certain conditions.

This will include a complete list of DTC's including DTC's for the charging system.

To perform a complete test of the charging system, refer to the appropriate Powertrain Diagnostic Procedures the DRBIII(R) scan tool. Perform the following inspections before attaching the scan tool.

  1. Inspect the battery condition.
  2. Inspect condition of battery cable terminals, battery posts, connections at engine block, starter solenoid and relay. They should be clean and tight. Repair as required.
  3. Inspect all fuses in both the fuse block and Power Distribution Center (PDC) or IPM (if equipped) for tightness in receptacles. They should be properly installed and tight. Repair or replace as required.
  4. Inspect generator mounting bolts for tightness. Replace or tighten bolts if required. Refer to the Generator Removal/Installation section for torque specifications.
  5. Inspect generator drive belt condition and tension. Tighten or replace belt as required. Refer to Belt Tension Specifications.
  6. Inspect decoupler pulley (if equipped). Ensure decoupler pulley is driving the alternator rotor.
  7. Inspect automatic belt tensioner (if equipped). Refer to the Cooling System for more information.
  8. Inspect generator electrical connections at generator field, battery output, and ground terminal (if equipped). Also check generator ground wire connection at engine (if equipped). They should all be clean and tight. Repair as required.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat. Stan Sayre, PA
< Last | Next >
  • I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat. Stan Sayre, PA
  • I AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP. TOM WHITTAKER USA
  • Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless! Rev. Jerry Baysinger Holts Summit, Mo
  • I recently asked a question about my 2005 dodge ram, and I just wanted to let my Expert know that he hit the nail squarely on the head with his answer. I wanted to thank him again. Greg Pittsburgh, PA
  • Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless! Jerry Holts Summit, MO
  • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
 
 
 

Meet The Experts:

 
 
 
  • Don 'Mo Lurch'

    Aftermarket & Factory Electronics

    Satisfied Customers:

    384
    Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years
< Last | Next >
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Aftermarket & Factory Electronics

    Satisfied Customers:

    384
    Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years
  • http://ww2.justanswer.com/uploads/2P/2paulm/2012-4-4_183431_justabswer.64x64.jpg Paul M ASE Master's Avatar

    Paul M ASE Master

    ASE Master Tech

    Satisfied Customers:

    117
    ASE Master Tech 20+ Years
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka - Moose)'s Avatar

    Chris (aka - Moose)

    Technician

    Satisfied Customers:

    93
    16 years of experience
  • http://ww2.justanswer.com/uploads/IV/ivestoy2/2011-7-21_44030_ivan.64x64.jpg Ivan's Avatar

    Ivan

    ASE Certified Master Technician

    Satisfied Customers:

    55
    ASE Master Tech w/ 20+ years in the field. Self employed for 9 years. Member of AUTOLAB radio show.
  • http://ww2.justanswer.com/uploads/AC/acuramstr/2012-6-6_181032_me.64x64.jpg AUTOMSTR's Avatar

    AUTOMSTR

    ASE Certified Technician

    Satisfied Customers:

    0
    ASE Master Tech, L1, CA Smog ,30 YRS EXP
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    Chrysler Technician

    Satisfied Customers:

    787
    ASE Master Technician advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    432
    ASE Master tech. 30+ years mechanic, shop forman, service manager