battery light on?

It sounds like the alternator is out but to be sure let check out his guide,

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Please run down this guide and report back.

The dash battery indicator light came on today while driving. During the drive home the light was coming on and off. Checked the voltage at the battery with the enigne running and light on and got 14.4 volts. Cleaned the connections and tried a different battery but the light remains lit. Car starts and runs fine and voltage while running seems correct. Any ideas what could be wrong?

the light signal comes from the PCM. Might want to check/clean connections at the alt plug- blue and gray are the PCM data lines. Also check the black/blue wire behind the right kick panel- dash ground.

Hi
The problem is voltage regulator in your alternator replace and the problem is fine
Sorry for my bad english

the battery light on the dash has recently been coming on while driving my 2002 ford focus wagon. as of today, the light does not turn off. i took the car in to the local mechanic who tested the battery with a voltmeter. the battery is just about one year old. the meter would jump from undercharging to overcharging and sometimes rest in the 'ok' area (sorry, i don't know the numbers). without any further diagnostics i was told it was most certainly a faulty alternator = $300 or so. i am not looking for a cheaper solution, but a firm believer in "measure twice cut once" and want to be certain that all possible troubleshooting is performed before shelling out the bucks.

i have a couple of questions:

1. can they test the alternator before replacing it to be certain it is the alternator that is causing the "jump" of the volts? and, if so, what would one look for when they are testing it to determine it is faulty?
2. does the alternator regulate the volts going to the battery?
3. if not the alternator, what else could cause the volts to jump?

any wisdom would be greatly appreciated.

cat

you can check the alternator with a volts meter
I would suspect bad alternator from your description
but you need and should check battery terminals and alternator terminals and wiring

Hi
Check voltage must to be 14.4 volts max not more if the voltage going 15 or 16 volts the problem.is alternator you can repair just to change voltage regulator and diodes
Sorry for my bad english

battery lite on alt charging at 14.5volts

If the battery is going dead, check fuseable link. If it isn't going dead, check alternator diodes. If that is good, check for body ground issues. Another circuit may have lost its ground and be grounding through that light turning it on.

Their is a clicking, clicking sound that comes on when driving and some times it make the battery light come on. Battery is good, changed two relay switches and a fuse already,changed the terminals on battery. It's not the alternator, it was replaced 2 yrs. ago. The radio and lights still work when the clicking is going on, although if driving at night the headlights will flicker when the clicking starts. It the door indicator is on, due to door not closed all the away, when the clicking starts, then the indicator light will flick off and on at the same time, to the same beat of the clicking. We have checked every thing we know and have gone through the Ford book.

does it do it while standing still or only when driving? and does it matter how many electrical items are turned on? have you checked battery voltage when this occurs to see if it is steady around 14v?

Yes it does it even when I'm at a light, I'm afraid the car will die. some times if it keeps going off alot and fast I will turn off the radioe and heater to see if it stops and it still does it just maybe not as fast. when the battery was checked it showed 15 the car was running and the headlight on and radio on.

when vehicle is stopped can you determine the location of clicking? is it very loud? 15+ volts to me is a high reading bordering overvoltage which may have effects on electrical parts.

Electrical problem
2001 Ford Focus 4 cyl Front Wheel Drive Automatic 160k miles

The battery light on the dash came on today. I don't a book on the car. Car cranks fine.
Thanks.

HI fixmescott and welcome to 2carpros

Get the alternator and battery load tested and comeback with the test results-this is where we start

2001 Ford Focus 4 cyl 260000 miles

i just had a new alternator and battery put in, half way home the battery light started flashing...what now?

If you had not had that problem before I would take it back and have the altinator checked for output. In this line of work I have seen altinators go bad shortly after insatlled. Before you go back check the wires and make sure they are connected tightly. some times a wire is loose or connection is not tight. If you can't find a wire loose then take it back where it was repaired and have them check it out.

thanx, the light was on before, so i took it in and they said i needed an altinator and that the battery had drained because the altinator was bad. but then light came on again on the way home. it was late so i just drove home. i checked this morning, it still starts up, but the light comes on again.

With them putting a new altinator in and the light coming back on I would still take it back and have it checked. I have seen brand new altinator being bad when they were put on. Not saying this is the case. Since they had put the altintor on they should check it to make sure it is charging enough.

Electrical problem
2001 Ford Focus Front Wheel Drive Manual

iv,e got ford focus zetec tddi, battery light is on constant,iv,e had alternator reconned

if battery light in dash is on then need to have battery and alternator tested and check all charging system wiring to ensure its tight and clean properly.

When i put the car in drive the battery light comes on
a few minutes later sometimes goes off when the rpm
climbs back up above 1,000 rpm's the battery, starter,
alternator and wiring still looks good no burnt wires.

Cleaned all ground with sand paper and checked coil
wires and fusible link to the + cable all max fuses are
good relays are not burnt or damaged but i have never tested one.

I am puzzled something is draining my battery after a period of time
could someone help me to figure this out?

Check alternator belt tension if okay-have the computer controlled circuit of the alternator field generation checked and tested

i have a 2001 ford focus zts, drove my care just fine, went to leave my mothers house and my battery light came one and my power sterring went out. i pulled over to the gas station and the power sterring is still full my battery is new, decided to drive back over to my mothers house and on my way around the corner my battery light came on again power sterring was still out and my car started to over heat. any ideas on what it could be?

check fuse in underhood fuse box first. then have the charging system checked, it may be belt slippage which by the way should be replaced along with tensioner every 60,000 miles. the power steering will need to see if pump is working so a pro will need to check that.

Electrical problem
2000 Ford Focus 4 cyl Two Wheel Drive Automatic

WHY DOES MY BATTERY LIGHT STAY ON. I JUST REPLACED MY ALTERNATOR

could be weak battery not charging or corroded/loose battery cables. need to have entire charging system inspected including alternator belt as well.

I need some expertise advice. Ok so heres whats up...my emissions light came on and stayed on for awhile, now it has gone off. It also idles really rough and also gets hot when is running for any long period of time. AND NOW, the battery light keeps coming on and off and almost died on me tonight!!Any thoughts

Hi there,

Get the alternator charge rate checked, and make sure that you tell them that It is an intermittent problem, also get a scan done to check for any set fault codes, start here.

Mark (mhpautos)