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BMW 745i Alternator

Power Problems: Troubleshooting Your BMW 745i Alternator

Your BMW's battery, no matter how reliable it is, won't be able to supply sufficient power to all your electrical components without its sidekick, the alternator. Run with a busted BMW 745i alternator and you'll soon find yourself stuck in the middle of the road with a dead engine. To make things worse, your headlights, radio, and even your A/C will all go kaput once the alternator fails to charge your car's battery. If you're having power problems with your vehicle, do some troubleshooting on the alternator right away. This will not only nip any problem in the bud before your alternator breaks down completely, but it will also save you from high repair and replacement costs. Here's a quick guide to help you out:

Malfunctioning electrical components

Flickering car lights, faulty A/C, and a dead music player are common signs of alternator damage. These danger signs will become more noticeable as the alternator weakens. With its dwindling power capacity, the alternator won't be able to supply enough electricity to charge all electrical components at the same time. When this happens, your lights, A/C, music player, and ignition system won't be able to function at maximum capacity. Before popping the hood open and doing some DIY repairs, check the alternator indicator service light on your dashboard. If it flickers or fails to light up when you start your engine, then you definitely have an alternator problem in your hands. Check the alternator's electrical plug and wiring for damage. Frayed wires and faulty plugs should be replaced right away.

Defective battery

A battery that frequently discharges or produces low voltage output is another sign of a bad alternator. These two, together with the voltage regulator, work hand-in-hand to keep all your car's electrical components running properly. Use a voltmeter to test the battery while your car is idling. The reading on the voltmeter should be around 14 to 15 volts. A reading that is less than 13 volts indicates a bad alternator. Have a mechanic check your battery, voltage regulator, and alternator for damage, and replace any malfunctioning part as soon as possible.

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  • Keeping the Power Running: Top Tips in Maintaining Your BMW 745i Alternator 27 February 2013

    Your BMW 745i alternator is the life support of all your electrical components. When it goes bad, your battery's charge will decrease, causing total electrical and engine shutdown. It is important to practice regular maintenance and perform routine inspections on the alternator to keep the power running in your vehicle. A battery may be able to charge your electrical components, but they won't be able to run at maximum capacity. Plus, the battery's life will also dwindle and eventually die without the help of your alternator. This part usually lasts between 40,000 to 100,000 miles, but you can still prolong its life with proper care and maintenance. Here are a few tips to keep your BMW 745i alternator in good working condition:


    Do a routine inspection on the alternator belt.


    One component that most car owners overlook when doing routine inspections is the alternator's drive belt. Its main function is to drive the alternator pulley and generate enough power to keep your battery and electrical system running. Over time, the belt may wear out and slip while driving the pulley system. When this happens, your alternator won't be supplied with enough electrical current to keep up with the load demand, and this will eventually result in total battery failure. Doing routine inspections on the belt will help you see early warning signs of damage and prevent alternator problems. A belt that is loose, glossy, or fissured should be immediately replaced.


    Replace worn-out alternator bearings.


    Your BMW 745i alternator needs high-precision needle bearings in order to revolve and function properly. When these bearings get damaged, you'll hear a loud grinding or rumbling noise coming from your alternator. The noise will sound like metal parts rubbing against each other, so it can be extremely annoying. If you don't want to hear this noise and encounter alternator failure, replace worn-out bearings right away.


    Regularly clean your alternator.


    Cleaning the alternator's internal components regularly is one of the easiest ways to maintain its condition. Use a dry soft cloth to clean the alternator brushes. To remove debris from the rotor, spin it and use polishing cloth.