The alternator is an alternating current generator and is used to exchange mechanical energy into an alternating current. The alternator recharges the battery and is the source of electricity in motor vehicles. Today’s alternators are controlled by digital signals. This is why the most modern equipment is required for their quality control. We can distinguish several electrical and mechanical failures where one sign is, among others, excessive noise. Causes Electrical causes can include shortcircuiting of the stator winding coil, as well as diode bridge damage, i.e. the short-circuiting of diode/diodes. In this case, it will be necessary to remove and inspect the alternator and change any damaged parts. Mechanical causes can include a damaged drive wheel. In this case, it is necessary to change the drive wheel and belt. Another potential cause here is a damaged bearing, which could include a rotor bearing/both alternator housing, front and rear. After diagnosing the damage, it will be necessary to change the full set of bearings. If the cause is a bent rotor axle or other damage, this can necessitate rotor replacement. Alternator removal is required in order to assess damage or 20 AFTERMARKET JULY/AUGUST 2023 TECHNICAL www.aftermarketonline.net ALTERNATOR FAILURE: BRING THE NOISE The experts at AS-PL consider the electrical and mechanical causes of excessive alternator noise change damaged parts. It is always recommended for a specialist with professional tools to carry out any work. Let’s listen to what our car says to us. If we stay vigilant, we can detect problems at an early stage and avoid any excessive costs. More information about alternators can be found via: www.as-pl.com
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