Ford focus battery light on but new battery fitted

Ford Focus battery light on and rear heated window not work. Car totally cut out, new battery fitted car worked again but battery light still on and charge voltage has gone down and is lower when car engine on.

My car has 77000 miles.
My car has a manual transmission.

Experienced mechanics share their insights in answering this question :
Hello there. It is quite possible that you have battery cables that are faulty, a damaged alternator or electrical relay that assists in the battery charging process. It is probably a good idea to have a professional mobile mechanic come to your location and complete a battery light is on inspection.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

An illuminated battery indicator can be caused by a number of issues, including: A loose or corroded battery cable. A problem with the alternator or voltage regulator. Damaged cells or plates inside the battery.
If your Ford Focus battery warning light comes on while driving, be sure to turn off your accessories, so the battery doesn`t drain further. The warning light usually means that the alternator isn`t working properly meaning you are operating solely on battery power.
The alternator belt is the connection that interfaces the crankshaft and alternator together. If your car`s alternator belt isn`t working properly, your car battery won`t get the charge it needs for your vehicle`s electrical parts. With that, your car battery light will frequently be on to indicate such an issue.
The message can reset by itself, but the car needs to sit undisturbed for at least eight hours. Perhaps with your work/driving schedule the car doesn`t sit long enough. Q: I have a headlight that is dim.
A blown fuse could be a cause of the battery light to come on. Excessive voltage in the electrical system can blow the fuse and prevent charging of the battery. A electrical technician can replace the fuse quickly and it an inexpensive fix.
It is unsafe to drive with your car battery light on. Issues that activate your car battery light, like a defective battery or faulty alternator, can cause your car to lose power. In these instances, your car won`t operate as it normally would.
This indicates that the alternator is not working properly. What is this? The most common cause of this problem is an alternator failure. Alternators are responsible for charging batteries in cars and other vehicles, and when they fail they can cause all sorts of problems with your vehicle`s electrical system.
The new battery does not have to be configured for the most current car models. Banner conclusion: No registration required; a check of the electrical functions after changing the battery is recommended.
What should you do if the battery warning light comes on? The first thing you should do is turn off any electrical systems in your car that you don`t need. That means turning off the stereo, air conditioning, heated seats and anything you may be charging in the car.
The battery light staying on is your vehicle`s way of indicating that there are issues with the: Battery voltage or battery power that`s generated. Battery charging system. Electrical system or electrical components, etc.
If your alternator has gone bad, your battery will have to power all of your vehicle functions without getting any recharge. In these cases, it won`t be long before your battery dies—even if you have a brand-new battery.
The battery light staying on is your vehicle`s way of indicating that there are issues with the: Battery voltage or battery power that`s generated. Battery charging system. Electrical system or electrical components, etc.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Ford focus battery light on but new battery fitted
ANSWER : Hello there. It is quite possible that you have battery cables that are faulty, a damaged alternator or electrical relay that assists in the battery charging process. It is probably a good idea to have a professional mobile mechanic come to your location and complete a battery light is on inspection.

Battery light came on went and bought a new battery battery light comes on about 1 minute after starting car.
ANSWER : The alternator on this vehicle is computer controlled and if the alternator is not communicating to the computer then it may default to a set charging rate that will show up as good when testing using standard methods. The computer and charging system needs to be tested using a scanner that is compatible that can check and test charging rates. You most likely do have a bad alternator on the car.

I got a new battery new alternator put in but my battery just gets drained I keep having to buy new batterys
ANSWER : This may be a sign of a failing voltage regulator or potentially a bad grounding problem causing a draw on the system. The voltage regulator is a unit that regulates the charging of the battery by the alternator. Often times this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. In either case, I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

in my car battery warning light appearing while driving.so I have replaced both battery and alternater still light is on
ANSWER : As you may yourself have seen, there are many reports of this fault with the Civic, that is a battery or alternator is replaced only to have the warning light fail to extinguish despite checking every conceivable electrical possibility. Your only recourse is to have a certified mechanic go through that exercise with your car and that involves first attempting to "re-set" the light. If the warning light returns, the alternator output has to be carefully measured both loaded and unloaded. All terminal connections have to be verified including all grounds. Fuses have to be checked for integrity (continuity) and the possibility of shorts, in for example dash wiring, has to be checked. To request this repair, simply request an electrical components diagnostic and the responding certified mechanic will seek a resolution to this.

The Battery Light is on and the lights and power mirrors are not working – 2002 Mercedes-Benz C320
ANSWER : Hi. If the Battery Light is on, this an indication that either the battery is bad, the alternator is not charging properly, or both of them are bad. Low battery voltage will cause the car to do abnormal things like have no headlights. There are other things that can cause headlights to not work as well, for example, a blown fuse, broken headlight relay, or, the most common cause, blown headlight bulbs.

I suggest you have a certified technician, such as one from YourMechanic, come to your location to determine why the Battery Light is on and suggest the necessary repairs.

I have Chrysler 300c. Battery light came on, changed battery and alternator but power still getting drained and battery light still comes on.
ANSWER : Hi, thanks for writing in. This may be a sign of a failing starter relay. The starter relay is a small unit near the starter that directs power to the starter from the battery. When this fails, it may cause a clicking sound and will not allow the starter to engage the flywheel when you turn the key. I would suggest having a professional from YourMechanic come to your home to diagnose your starting issue to determine the solution to get you back on the road.

Crank no start
ANSWER : Hey there, thanks for writing in about your 2003 Ford Explorer. It sounds to me like you either have no fuel or bad fuel at the injectors, or no spark to spark plugs. Try to narrow the problem to one of these possibilities. If you just got fuel before it dies, then you may have excessive water in the fuel. Take a fuel sample and let it settle in a cool place to see if water is in fuel. You already ruled out many components, but you have to double check and make sure that each test was done correctly. If you’d like further help with this, my recommendation would be to have a certified mechanic, such as one from YourMechanic, thoroughly diagnose the no start issue in person in order to have this properly resolved.

Battery light stays on and overnight battery drain. 2006 Land Rover LR3
ANSWER : Hello – this problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. The specific components on that circuit can then be checked for current drain problems. A professional mechanic, like YourMechanic, can come to your location, and perform this procedure for you, and identify, replace or repair the failing component.