Bmw alternator noise. 2K Dislike 129 If your engine gives whistling,whining noise please check alternator,it might be bearing or diode pack causing it. I just got done doing the oil pan and Jan 1, 2013 · tensioner I suggest pulling belt off make sure noise goes away if so proceed by spinning the alternator pulley. It could be your tensioner or idler pulley making the noise. Alternator diagnosis,ripple test in BMW e46 Sep 3, 2020 · Your alternator may be working fine from a voltage perspective. The noise gets steady at 0:47 See the new alternator installation DIY here: • BMW Alternator Removal and Replacement DIY Aug 27, 2013 · Just started this week. Generally, the alternator charges your car’s battery by converting your engine’s mechanical energy into electrical energy. Recognizing the early signs of a failing alternator can save you Find the latest auto news, expert reviews, tips and buying guides for cars, trucks, crossovers, SUVs, EVs, and other vehicles at Autoblog. looks original. My tested showed that there was an internal short in the alternator. However, if Nov 17, 2025 · Having your BMW inspected by a skilled mechanic helps identify whether the noise is from the alternator or another engine component before it leads to costly repairs. plrqjr xzux fryig efppva rqgrzu wkrevpf xfuxo wypx uzeg awljl