battery light on but alternator is charging

This 2007 Ford F150 came in with the complaint that the battery light would come on about 30 seconds after the engine was started. 17,895 satisfied customers. (This is usually the simplest to fix.) Although, it looks simple but the reality is more difficult, so you must have to detect and solve the problem. And why it has to be an incandescant globe (but you could use two LEDs to indicate which has failed). ignition off - light is off, battery does not go flat overnight. On an 2005 and other years it has a module that the ground lead goes through from the battery its just below the - battery terminal it regulates the charge. I'll post back updates in case anybody is interested. So, requires a knowledgeable tech to troubleshoot. Also, if the belt is misaligned, not well fitted, or too tight, the light can come on. Anyone seen this behavior in a major appliance? Battery is 12.36 volts at rest. The maga fuse tested good. If the alternator has 12v on the coil and the bulb has 12 going into it, then both sides of the bulb have 12v + and no flow so no light. It may not look broken but it could be broke inside the insulation. The battery light will turn off when I unplug the connector from the alternator but when it is plugged in the light will come . But, I'm seeing 14 volts at the positive battery terminal. A good battery should read 12.6 volts across the posts. The battery light on your Lincoln Town Car is designed to alert the driver to an issue with the vehicle's charging system. Thinking that the car is over five years and never changed the battery, I figured that is what it has to be. been a couple of months since I changed alternator and module so I don't remember voltages but it is arround 12 Volts at idle now and goes up to 14+ at 2500, just barely happened upon this site so I'm asking here since I've already asked . Today I exchanged that alternator on warranty and the battery light is still on. The most common is, again, a loose connection either with the control plug (aka "relay" plug-in), charging line connection, or the ground. Battery light came on, with the original OEM alternator, however system seemed to be charging. Besides the battery light, if the alternator belt is faulty, the car's hood might squeal when the vehicle is running. The alternator is not charging the battery and there is a power draw instead of a charge. Alternator Belt. What's happening and why. I have a 2012 Charger 5.7. About a minute later the battery light comes on again. If a red Audi battery light comes on and stays on in your Audi instrument cluster, it indicates a problem with the alternator, battery, or charging system. You should be getting roughly 13.5 to 14 volts when the alternator is charging. Checking the voltage with the battery light on is the key here. I am gonna go ahead and get a new Bosch Alternator. 2004 Expedition 5.4. A shorted battery could cause the alternator to overheat and a diode could fail or the windings short out. Then 12v is sent through the dash bulb and into the alternator. The second time the battery light came on and off and was charging around 13.5 and would dip down to around 12.8. The other is a blown fuse or defective connector or relay, which could have been broken or shorted when the alternator was installed or on the first start-up after its installation. Alternator died last August, so service center at dealer installed new alternator at that time. The battery light on but the alternator is charging is a common problem that many drivers can face. Took back to repair shop (a local store of the same national chain). If the alternator is not charging the battery, your Audi may only run for a brief time off the battery then shut off. Second, the warning light may fail to go out when you raise the engine speed. If your battery light comes on, you either have a bad battery, bad alternator or poor connection somewhere in the charging system. Remanufactured alternators are not 100% perfect So, it is very possible to get a bad one. If you get the battery light replace the alternator and battery if yours is old. I installed new battery and altenator on 2001 ford escape 3.0l 4x4, battery light still on, and the alt not charging. While a Town Car can drive for a brief period without proper . The new alternator seems to be fine. If necessary, remove the cover to access the positive and negative terminals of the battery . The charging system relied on two sources of voltage in order to turn the light . I replaced the alternator and the truck fired right up and runs fine but now the red battery light is on. Third, the light may behave normally at low revs but then come on at high engine speed. I am having the same issue with a dim light staying lit after changing the alternator wich was giving me a full battery light at highway speeds and battery light off when at city speeds. Took it to autozone, they tested it - bad alternator. I have now changed the alternator to a brand new one but the problem remains. We have checked the battery cables to make sure they are free of corrosion and tight. Installed the new alternator and the light is on all the time now. The battery is receiving a charge from the alternator (14.5 volts) when the vehicle is running. Got a 99 alternator from a saturn. Replaced alternator and battery, was on my way. You could get a battery charger for about $50 to plug it in at night to top it off to give you more time to shop around for a better deal. This is the same connector that lets the on-board computer know if the alternator is charging or not, which is what the battery light actually means. Whenever the engine was started and the alternator produced electricity, the voltage would recirculate through the entire vehicle's electrical system. Feb 23, 2010. With the engine off, you should get a reading somewhere between 12.0 volts and 12.6 volts. Make sure you have the whole charging system checked out. I removed the battery cables for about an hour and tried another battery to reset it and nothing changed. Difference between this alternator and the other is that my battery light remains on. Have 2008 Honda Odyssey Touring package. Still no battery light. Battery light on. Fast forward to today, the light is still coming on and the voltage meter for the battery on the dash goes from 17 back down to 11 and usually stays right at 11 or a little below. The cranking starter test showed 12.05 volts. Check to make sure the wire is not broken. I've seen the intermittent battery light when high loads are placed on the alternator like both AC units, radio, etc. A new alternator will rectify the problem. And it can vary by +/- 0.1vdc so I have seen on my monitoring meter between 12.4 and 12.6 in the low charge state. I replaced the 180 Amp alternator and battery at the same time. The battery light or charging warning light, available on the dashboard of your car, indicates malfunctioning or poor charging of the battery.This light illuminates whenever the charging system does not charge the battery with a voltage above approximately 13.5 volts. The alternator belt connects multiple components. When I restarted the battery light is on. Usually, the light turns off after some time, but if it stays on even when you are driving, then pay attention. All of these components are good and in working condition, yet my battery is still not charging. I tried searching on here and only found a couple of threads indicating that the alternator may be malfunctioning. The pigtail was different so I rewired the cables to this harness. Perform a battery and alternator test procedure. Possible Causes Why Light Is on but Alternator Is Charging 1. Battery is charging, so why is the battery light on?? No illumination Had it towed to repair shop. The battery light on the dashboard indicates a malfunctioning battery & battery charging system (faulty battery circuit). PEP boys said it needed an alternator, replaced alternator, light still on, battery is good, alternator is putting out between 13.8 and 14 volts under load. Turn the truck back on then getting 12.5V won't go above that and the battery light remains on. If necessary, remove the cover to access the positive and negative terminals of the battery . When the alternator is charging it should be 13.5-14.5v. Two weeks ago the battery saver light came on. Car cranks up fine and I go for a test drive. It stays on for about 5 seconds and then turns off for about 5 seconds cycling continuously. The tension belt is good. The Subaru ECU has an "Alternator charge Cut-out Function" that is controlled by the electrical load on the vehicle, the vehicle has an alternator with a 3-pin plug (C=computer control: S=Battery sense: L=Warning Lamp). Note::. Drive a while stop the truck turn it off etc. Normal charging system voltage is between 14.2 and 14.5 volts. I swore that the last time would be the LAST time to R/R the darn thing. The battery light thing started . All my fuses have been pulled and checked fine. The alternator charge/warning light comes on while the engine is running. C. Check the large power cable to the alternator and the fuse, usually, a large 40-60 amp fuse near the battery. Check the small power supply wire and the charging light wire. My alternator wasn't putting out enough voltage to charge the battery and run the RDX. However, if cracked or broken due to continuous use or age, the battery light might come on. If it's a bad connector, it wouldn't be charging, would it? I have a 2008 Patriot 2.0 CRD and the battery light came on and stayed on whilst driving the other day. Also tighten down the positive cable on the alt correctly. With the engine off, it reads 12.5V, with it at idle, it reads somewhere between 13 and 15V (it has kind of a vague scale). Autozone diagnosed the alternator as under charging. Last Thursday, the Check Charging System light started coming on for several seconds and then going off. The charge voltage is 13.9 volts st the batter and alternator, call the alternator help line and they had me check the small . Today, battery light on and stays on. Battery is showing 12.4 volts (so low charge, but getting there). pulled the alt again, took it back to my rebuilder tests perfect.. checked the vol … read more. charging fully ay 14.5. So we retested the battery and the dude said it's hold about half charge. 3. Measure voltage across the battery with your DMM. Now the second alternator has the battery light on but very dim constantly when engine is running. Connect the negative clamp on the negative terminal. The alternator is charging. Battery problems can cause alternator problems and vice versa. Battery light stayed off for 3 separate drives of the car. The alternator belt connects multiple components. Disconnect the plug at the alternator, check it for corrosion and damage, plug it back in and see if the light is still on. Hello looking for some info on a 05 duramax light on dash says battery not charging only when in high rev had a problem before changed alternator so its new any suggestion thanks.

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