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 Mike Your Own Question
Mike
Mike, Technician
Category: Car
Satisfied Customers: 39198
Experience:  Tech Expert
9261905
Type Your Car Question Here...
Mike is online now

wy do my battery light com up after i changed the alternat

This answer was rated:

wy do my battery light com up after i changed the alternator

Mike :

Hello and Welcome...

Mike :

My name is XXXXX XXXXX Im happy to help --

Mike :

What was the original fault that lead you to replace the alternator?

Customer:

the same

Mike :

Hello - So you had the battery light on yes -

Customer:

battery light com up

Customer:

yes

Customer:

every 10min

Mike :

Ok - at the time -did you carry out a battery charge test?

Customer:

yes its ok

Mike :

No - at the time , before you changed the alternator... did you test the output then?

Customer:

yes

Mike :

And what were the readings then?

Customer:

12.6

Mike :

12.6 when standing / tickover or revving as well?

Customer:

wait, this is when it is not lit

Customer:

when the engin working is 14.3

Mike :

Ok - Im trying to find out the readings before you changed the alternator... were proper tests carried out - to see what the voltage output was -

Customer:

I dont know in the shop told me that is the alternator and after his shift was unable to find the problem

Mike :

Ok so - you are going off what the shop has done - you haven't done the work yourself?

Customer:

yes

Mike :

What then are they saying is the problem - ?? Have they run proper tests since?

Customer:

i hope

Customer:

were do you tonk is the problem

Mike :

Basically - you could have a faulty "new" alternator - it does happen.. It simply needs to be checked off vehilce - or - on vehicle but with a tester that tests it seperate to the vehicle wiring - that rules out any issues with the vehicle that way - or in. If its a faulty alternator - then a replacement will fix this. If not - that will show up too.. Then, the wiring needs to be checked - carefully through... Often you get bad wiring that will cause this issue - but if that is ruled out, then its either a relay or computer fault - these run through the cars computer.

Mike :

For the computer to be tested, it has to be connected to a suitable diagnostic machine - you need to be sure the shop you are using has this - otherwise they cannot run the tests - you would need most likely a Dodge shop - or one that has that level of test equipment.

Mike :

So if all else checks out as ok - and its looking like a computer fault - you must have that test properly - its too expensive to change out on a guess.

Customer:

thanks i hope to discover the problem

Mike :

That is the way for sure... thats the best way - and the cheapest. if I can help you anymore at all at anytime with this, do let me know.. If we are done here for now - I do just need you to click on the OK ratings for me please.

Mike and other Car Specialists are ready to help you
Thank you Vladislav for doing the rating for me.

I hope all goes well for you - Im sure it will if you follow through as above.

Very best rgds to you - and you are welcome back anytime.

MIKE.