An alternator is a 3 phase device. MECHANICAL A slight Whine from the alternator under load is normal. It's not a wheel bearing as the sound is there even when barely moving. Because your car often will not start when the alternator is dying, an alternator that's on its way out can easily be confused with a dying battery or starter. It is an electrical whine, not a bearing noise. Whine noise caused by a bad alternator on a 2010 Ford Fusion 2.5 engine. Go have your alternator load tested at like oreillys or napa or autozone. I suspect that one of the diodes associated with a particular phase has failed while the other 2 phases are charging properly. When I first start it, the alternator whines fairly loudly. Alternator Whine. This is causing the whine. Air causes bubbes in fluid and pump whines. Check under the hood for broken hoses or loose connections and repair any that seem loose or broken. Alternator slippage and undercharging can also be caused by a bad alternator pulley. Overrunning Alternator Pulleys (OAP) are used on a number of late-model import and domestic vehicles. OAP pulleys have a one-way clutch inside the center of the pulley that slips and allows the pulley to free-wheel when engine speed suddenly drops. Circuit causes Alternator whine can also be caused by poor electrical connections, especially at the battery. Once the battery does its job starting the engine, a healthy My concern is that it is transmission related, but the dealer thinks it may be pulley related. Once … ETKA does show only Valeo available for 180A alternators, it also shows there is a 140A Bosch option for some Golf R's. Check Latest Price. Yes,but the fact that the ripple is not being filtered correctly by the battery means that either the battery is bad, or the car stereo has very poor input tolerances. It's a low, steady whine, not screechy or marble-y.The alternator tests bad under heavy load (with AC and lights and rear defrost, voltage drops below 13V and keeps dropping), but puts out voltage to spec when not loaded like that. Under heavy electrical load the alternator cannot keep up with demand so that is the reason the voltage warning light illuminated briefly. Mar 13, 2016. This is easy to troubleshoot. So to recap you replaced the bearings in the original alternator and the same whine remained. Valeo alternators are known to be crap and can whine under load from new. An alternator will have a very noticeable whining sound when there's an internal short, i.e. 51k miles. Try this: get a water spray and a friend that can help you to rev until the noise comes in, then start to spray one suspecting item, say, the alternator's pulley/belt. When a diode in these older-technology alternators had failed, the battery would never fully charge and the pilot would report a whine in the headset. I remember a previous week. With the engine running and a comm radio on, turn off the alternator. Perhaps the whine only happens when there is a heavy load on the alternator (i.e. I narrowed it down by ear, then used the typical stethoscope and it sounds like a bearing in the alternator. « Reply #7 on: May 20, 2013, 08:00:03 pm ». This said, almost without exception, alternator whine is caused by a ground loop (another reason to properly wire your installation). Alternator slippage and undercharging can also be caused by a bad alternator pulley. With the windows up, … Re: Dreaded Alternator Whine in car stereo. It is also not there when not pressing the accelerator. I just replaced the alternator with a refurb from napa and that's when the noise started. Have you tried some belt dressing to see if that solves it? It's just a high pitched whine that gets louder whenever I have accessories on. Replace the alternator ot have it rebuilt. close to full output current. If not the wiring you're already tracing you may have a short, or bad relay somewhere. Some alternators will have a very slight whining sound when under a heavy load, i.e. Nothing horrible but noticeable if you're standing next to the Jeep. This whining noise provides an indicator that the alternator is charging. It should also be accompanied by the battery light. Whine can be caused by a large spike in the AC component as shown in the oscillograph at left; a very rare occurrence nowadays, and one which typically turns on the MIL (Maintenance Indicator Light). Just a bit of water there...and do with the rest if you don't see the noise disappear. It actually sounded like it originated from the passenger side under the dash. Whining noise may be alternator, but the examples you posted sound more like power steering whine. So I have a 2014 Camry 2.5L with 107,000 miles on it and I recently have been hearing an intermittent alternator whine that increases with load when it does decide to appear. In most cases the whine is only … It's a high-pitched whine and it only appears when it's under load--lifting off the throttle makes it go away immediately. Comparison with other Amplifiers. Overrunning Alternator Pulleys (OAP) are used on a number of late-model import and domestic vehicles. So I had that replaced with a reman and the whine is still there. When the condition is present, unplugging the alternator wiring harness makes the … I'm planning to replace it because of the bad test and the noise. they do it for free. I have an 2000 OBW 2.5L manual. So a battery with a bad cell could result in a heavy current load and cause a whining sound. As you stated earlier the Harmonic Balancer was coming loose. Over the past week, I had been noticing a whine that seemed to vary with RPM; higher RPM, higher pitch noise. A bad diode in the alternator will cause noise. The 11.7 volts you stated does not indicate it is charging correctly. anyone know where I can buy this one wire connector plug for the alternator? A high pitch whine increasing with RPM is diagnostic. If the whine goes away, you've found the problem. Mar 01 2011, 11:07pm. A diode pack on the alternator converts AC current from it's windings into DC to charge the battery. i.e.- when I have the A/C on, KC lights, etc. It is usually way more noticeable on the A.M band of the radio. Sometimes the noise you hear when the alternator has high load imposed on it at a lower RPM, is due to the conversion of AC power to DC power. A diode pack on the alternator converts AC current from it's windings into DC to charge the battery. The battery "smooths" out the pulses of energy from the alternator. For more information on this bit, see here: http://auto.howstuffworks.com/alternator3.htm. To eliminate the alternator whine, you need to remove this AC signal from your DC supply. Jul 14, 2007 (Edited) Most common cause of Alternator failure is bearing failure. On Alternator Whine, A Noise That Messes Up In-Car AUX Ports.
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