Battery Light

[BSouders80]

At what voltage does the PCM kick on the battery warning? I was driving on highway at 65 mph and the battery light on the dash came on. Very random. I grabbed by tuner real quick as it shows the current voltage in the "about" menu. I was around 12.55 or 12.60 volts. I did look again later and I was closer to 13 volts.

Just curious when the battery light does kick on.

TIA

Brian

 

[BSouders80]

*bump*

 

[The Car Stereo Company]

not sure on that. however you should check the voltage and amperage coming from the alternator while it is running. also check the battery.

 

[MurderedOutSVT]

^ this


My first thought is alternator not charging correctly.

 

[P4SHOCAT]

Not sure what voltage the light comes on at. The battery should be charging between 13.5 and 14.5 while driving. 12.6 to 12.8 with a full charge. A voltmeter will be your friend.

 

[BSouders80]

Thanks for the info. I'll get some voltages and report back.

 

[rschap1]

I just went through a LOT of head scratching until replacing the alternator on what is my daughter's Lincoln MKX. A bit of a pain to replace, I wanted to make sure that is what was needed. Sounds similar to what you are describing. It would work intermittently. Whenever the light would come on it would show battery voltage 12.4+. With alternator working it would be around 14 or more. Finally replaced it and all better. Good luck with yours.

 

[Nesc204]

How much mileage do you have? I had mine rebuilt at 170k. The brushes were down to the nubs. Did it just in time or I would of been dead on the road