Also check and make sure your cable ends are clean and tight. I'd check the light grounds first though. 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 … I tried to start it ten minutes later but the battery was almost dead, just heard clicks. But once I sustain a steady speed it does not, and eventually lights stop flickering. The more i change in speed specifically accelerate or even go up hill, the more the car seems to loose charge? Ive already spent $1000 for the new batt alternator and labor. Just some things to check got charging tested by autoparts store. It's probably blown. They tested the new alternator before I got it and it looked good showing 14.3 volts. This should make your lights maximally bright all the time, and decouple them from the alternator output. 13 comments. 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. 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. The battery light is on but the voltmeter says 13.5 to 14.5 volts depending on the engine revs. If the serpentine belt is loose, it often results in various noises coming … 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. Hi guys, So this what we did. 81% Upvoted. The alternator is responsible for providing power to your car’s different … Okay boys so im really lost on this once. What can it be ? Took it to pepboys since they could replace the alternator quick. 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. When engine is off the volts drop to about 12. Also everytime we check charge on batt and alt , its pushing out -perfect everytime. Tested voltage. 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. Bad, dirty or loose alternator belt. Edit 2: Apparently the flicker is caused by a bad rectifier in the alternator, which is not always replaced when an alternator is rebuilt. Recently i noticed that when driving and engine reaches above 2000rpm my lights begin to flicker, dashboard, dome lights, headlights, everything. Yet ever since, I will accelerate and my battery light will come on , the dash lights flicker and headlights as well. I'd check the light grounds first though. Bought a new alternator due my old one FAILED the test. If I do 4-5 back-to-back restarts, the battery starts getting weak. IIRC 13.7 volts is normal for these cars. 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. Replaced alternator. 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. So to get to the point, I installed the new alternator. This should make your lights maximally bright all the time, and decouple them from the alternator output. Before it failed, no weird lighting issues. 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. 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. Those are possibilities. 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. They're bright, nothing flickers at all. I bought this vehicle as is. I tried to find the same bulletin and only found a pre service bulletin for flickering lights. Well put on a new alternator since I was told by my tuner it’s only getting 12v at wot. So as the unit hits the "dead spot," the power wanes, causing the lights to flicker… Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved. And check the circuit fuse for the radio. The voltage for the vehicle checks out and is what it should be. 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 ? Alternator connection needs to be clean and tight…batt terminals of course as well. ). 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. But, I still have the problem with my head lights flickering & stereo going off then on when I accelerate to go. Any ideas? I checked the alternator which was bad, producing less than 4 volts. 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. I drove it around, shut off the engine and was able to restart it. Loose or dirty battery cables check both cables both ends. somewhere in the headlight circuit, and you're seeing the voltage fluctuate with the alternator speed. The abs/traction, check engine lights and many others can come on due to a low voltage, or high voltage problem. Alternator. At this point the light is completely on and not flickering off at all. 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. So new batt and alternator. Everything flickers . Brand new alternator same problem and i dont think its the battery. Testing so far. 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