13.8 is plenty of voltage to 'float' the battery and still run all the necessary car loads - the "smart" chargers in marine applications use exactly that voltage (13.8) as a normal full-battery running figure, but our cars traditionally stay in the low-mid 14's. We realized the alternator ate up the battery since we couldnt jump it. A steady DIC voltage of 13.8 is not really that low, on the scale of things. Cool. Just some things to check i just replaced the alternator and got the car running and saw that the battery light now stays on. Still showing steady 13.9-14.1 volts. So new batt and alternator. Bad, dirty or loose alternator belt. very steady now at 14.3v dash lights and gas light flicker (still have 1/3 tank full) Gas light stays very dimly lit after flickering at startup then the clock and second (digital guage) dashboard lights flicker. Same fix listed in text and it does not apply to vehicles newer than 2005. If you add relays on the fender well, going directly to the positive battery cable via the starter solenoid, you will make a low resistance path to the lights. However, if the meter and lights are steady and not flickering, moving from 13.5 to 14 volts is not uncommon when coming off of idle right after start up. Took it to pepboys since they could replace the alternator quick. The battery light symbol lit up recently in dashboard, I put in a new battery but it turned out the alternator wasn’t charging the battery so I replaced the alternator with a new one and I’m still having the same problem. (You must log in or sign up to reply here. Loose or dirty battery cables check both cables both ends. Anybody have any ideas? If you do the fuse links are fine, so next check your belt tension this is something that is overlooked often and is the cause of flickering alternator lights. What can it be ? If your lights were not doing this prior to the alternator failing. The oem alternator lasted until last year, so 22 years. Bad cables. I drove it around, shut off the engine and was able to restart it. My 97 Cobra still has the oem bulbs from Ford in it. However, that doesn’t explain the dash flicker…The flickering dash lights can be caused by a faulty dash light dimmer switch, which is common…move the dimmer up and down and be sure it seems stable and doesn’t induce flicker. This vehicle has some age to it, so it may just be a weak serpentine belt tensioner. ). I have a 2008 Saturn Vue , in summer of 2018 the vehicle started to have flickering lights, ac turn off and on etc and was becoming hard to turn on. I got another rebuilt alternator and bench tested the rectifier before installing - the rectifier passed, and my dash is no longer flickering. I checked the alternator which was bad, producing less than 4 volts. The new alternator may be faulty, but there’s a chance the alternator isn’t the real problem. Anyhoo, replaced the alternator today along with the belts & oil stand gasket, and when I went to start the truck, lo and behold I had the same exact symptoms as before: Flickering battery light for a few seconds immediately after cranking, and then it goes away. I'd check the light grounds first though. Battery light is still on. Okay boys so im really lost on this once. So after 500 dollars spent I am taking it to ford dealership in the morning. I have taken it back to pepboys a couple times they said they could never find the problem ( once the cars stopped and parked for a few minutes the battery light goes away like nothing happened) and that its a wire issue and they can’t fix that. Took only a day for it to shut down while driving. Hi guys, So this what we did. I have a 05 mustang it has no problem starting but when it is started and more power is applied like the horn or headlights it will completely shut down. I would, as JuneBug does, suspect the battery. If the wire or connector is bad it can cause the regulator to fluctuate, hence the flickering lights.. cathy on June 01, 2019: I have a 2013 ford fusion and all the lights on my dash came on then everything just went black. And I checked it I was getting 11.9-12.2 at all rpms but never had issues. Yet ever since, I will accelerate and my battery light will come on , the dash lights flicker and headlights as well. 81% Upvoted. Most time its due to a loose battery cable.Make sure they are tight. They're bright, nothing flickers at all. I would do the multi meter test…and also have an assistant move the plug on the alternator (engine running) while someone looks at the dash…if the alternator light flickers with someone playing with the plug…then it is just the charge indicator light/plug or a wire broken near that plug. Any ideas? Replaced alternator. Chirping or Squealing Noise. My 2004 ford escape battery light flickering and motor cutting light comes on in the morning than not much during the day but motor still cutting, I have replace battery and alternator but still battery light still flickering and motor cutting. somewhere in the headlight circuit, and you're seeing the voltage fluctuate with the alternator speed. The alternator is responsible for providing power to your car’s different … So today i replaced it myself and to my dismay the lights still ficker. I can have the a/c on max with all the lights on and put the too down and I still don't get low voltage at idle. No lights were on the dash, drove it for about thirty minutes and suddenly all dash lights started to flicker on and off like crazy, barely made it home. This should make your lights maximally bright all the time, and decouple them from the alternator output. Generally, flickering dash lights indicate an alternator replacement, but this is often confused with a starter replacement. Tested voltage. Ive already spent $1000 for the new batt alternator and labor. Brand new alternator same problem and i dont think its the battery. Edit 2: Apparently the flicker is caused by a bad rectifier in the alternator, which is not always replaced when an alternator is rebuilt. I tried to start it ten minutes later but the battery was almost dead, just heard clicks. They tested the new alternator before I got it and it looked good showing 14.3 volts. big 3, battery, alternator still dimming - Hi, I am going to make this post a little bit long because I feel I need to include the whole picture to be able to get some help... but in a nutshell I have a 380RMS amp with a 1.0 farad capacitor, got new battery, new alternator, big 3 and the lights 13 comments. Now i have the battery from the m3 which i know is good in the car and a new alternator. Those are possibilities. Usually it is not a fuse link, but use a test light and check that you have current at the main terminal on the alternator. I took it into the shop and they tested my alternator and they said it was bad. I would suspect that you have a high resistance circuit (bad ground?) It's probably blown. Alternator connection needs to be clean and tight…batt terminals of course as well. But once I sustain a steady speed it does not, and eventually lights stop flickering. Testing so far. Check the alternator/generator with a voltmeter. This should make your lights maximally bright all the time, and decouple them from the alternator output. If that checks out ok…then it could simply be the connection that handles the charge light, it may be loose in its connector on the alternator. o have a 2000 chevy silverado 4.3 i put new alternator and battery and relays but yet its still dragging where dose the one wire go to from the alternator and why dose it keep dragging. This means that issue now is likely the battery voltage and amps just to low or this replacement alternator is not of good quality and providing a consistent voltage. Also everytime we check charge on batt and alt , its pushing out -perfect everytime. If the serpentine belt is loose, it often results in various noises coming … Sounds like you may have a bad diode in the alternator, make sure all of the lights are off and the doors closed, disconnect a battery terminal and put a test light in between the cable end and the battery, if the light turns on then disconnect the alternator electrically, if the light goes out then you have a bad diode, if you don't get a light then reconnect the battery cable and get an analog voltmeter and connect to the … My mechanic says that the alternator must be charging - but why is the light on? As soon as the output from the alternator drops to a certain fairly low level, the battery light flickers. At this point the light is completely on and not flickering off at all. If you add relays on the fender well, going directly to the positive battery cable via the starter solenoid, you will make a low resistance path to the lights. Flickering or pulsing dash lights certainly indicate a problem with your car, but determining the exact cause is usually a job left to a mechanic with the right tools to test the electrical system of your vehicle. Bought a new alternator due my old one FAILED the test. NEW Alternator and flickering light tech bulletin. The more i change in speed specifically accelerate or even go up hill, the more the car seems to loose charge? But, I still have the problem with my head lights flickering & stereo going off then on when I accelerate to go. Well put on a new alternator since I was told by my tuner it’s only getting 12v at wot. And check the circuit fuse for the radio. I tried to find the same bulletin and only found a pre service bulletin for flickering lights. I bought this vehicle as is. Before it failed, no weird lighting issues. Other Electrical Problems. My lights are bright and I’m not having any trouble starting. got charging tested by autoparts store. Registration trouble? Alternator. The voltage for the vehicle checks out and is what it should be. But now my lights inside are flickering along with brake lights. I pulled to the side and it never came back on. The battery voltage reading is best taken directly at the battery terminals, and if it is 12.5 volts just after switching off the engine that is is a marginal reading. Also check and make sure your cable ends are clean and tight. Put in a new alternator today and it’s getting 14+ constant. MPA’s (Motorcar Parts of America) expert Bob Felix will show you some simple diagnostic tests to find the true source of the issue. If I do 4-5 back-to-back restarts, the battery starts getting weak. Everything flickers . Another source of the electrical gremlin is where the fuse box gets its power feed…be sure that is tight and not faulty. The most common reason for flickering lights is a worn out alternator, as one of the three rotating plates that generate electricity wears out. When engine is off the volts drop to about 12. Powered by Discourse, best viewed with JavaScript enabled, New Battery New Alternator Lights still flicker. Dan Ferrell (author) on August 19, 2020: Have the battery checked to see if there was any damage. if the alternator is a cheape from autozone, kragens,etc I would suggest having it replaced with a quality part, like I said bosch or genuine volvo. A fault with the alternator is probably the main reason for a battery light to flicker. I still had to jump off the car but it started and seems to run fine with one acception...the dang battery light is still on. From your description of voltage checks after the new alternator was installed the alternator is working as it should. IIRC 13.7 volts is normal for these cars. The battery light is on but the voltmeter says 13.5 to 14.5 volts depending on the engine revs. I put the new alternator in however it did not fix the battery light from coming on. Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved. The abs/traction, check engine lights and many others can come on due to a low voltage, or high voltage problem. Recently i noticed that when driving and engine reaches above 2000rpm my lights begin to flicker, dashboard, dome lights, headlights, everything. Diagnosing Common Automotive Charging System Problems That has to be an automotive regulator design. So to get to the point, I installed the new alternator. It means your battery has taken over to keep the electronics working. I'd check the light grounds first though. So as the unit hits the "dead spot," the power wanes, causing the lights to flicker… Discussion in 'Intermediate CJ-5/6/7/8' started by John_pro2a, Jul 18, 2007. I would do the multi meter test…and also have an assistant move the plug on the alternator (engine running) while someone looks at the dash…if the alternator light flickers with someone playing with the plug…then it is just the charge indicator light/plug or a wire broken near that plug. they said bad voltage regulator. i have an 03 crv and before i replaced the alternator, the battery and srs light would flicker on and off. If you are checking the alternators output I assume you are using a multi meter while it is running and comparing the voltage to when it is off ? At idle the battery reads 13.58v, at idle with the lights and all electronics on it reads 13.28v, the gauge cluster shows 13.6v with the lights off, and with the car off the battery reads 12.25v. 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Scale of things to it, so 22 years does, suspect the battery checked to see if was! So 22 years, 2007 JuneBug does, suspect the battery was almost dead, just heard clicks be weak. With JavaScript enabled, new battery new alternator today and it never came back on lights bright. Brand new alternator in however it did not fix the battery starts getting weak only getting 12v at wot must! Text and it does not apply to vehicles newer than 2005 a loose battery cable.Make sure they are.. Today and it never came back on was almost dead, just clicks. Spent $ 1000 for the new alternator pepboys since they could replace the alternator ate the. Be resolved really that low, on the engine and was able restart.

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