Your BMW 740i alternator has a big job to do, especially if your car is decked out with accessories. The 740i alternator is responsible for keeping your battery charged and sending voltage to all of the electrical components of your car. In a bare-bones car, the BMW 740i alternator may be responsible for only a few components: lights, horn, heater blower, and windshield wiper motors.

However, most modern cars have a rather long list of accessories for which the 740i alternator must provide power. Your stereo system, power windows and locks, seat warmers, engine pumps, and high-powered headlights all represent a power drain on your BMW 740i alternator. This means the modern 740i alternator must work harder than ever to keep your car running down the road without a hitch.

Where older BMW 740i alternators only needed 50 or 60 amps, most 740i alternators today use 100 amps or more. Even so, your BMW 740i alternator consists simply of bearings and shafts in a rotating assembly. Over time, your 740i alternator is going to lose its effectiveness, and eventually stop working altogether. The warning signs of a failing BMW 740i alternator typically involve a loss of power in some way. Your bad 740i alternator may announce itself as dimming headlights or dash lights, slowed power windows, or hesitation when you are accelerating. If any of these symptoms are present in your car, you should definitely check out the condition of your BMW 740i alternator before your battery fails altogether. When your 740i alternator needs to be replaced, it is a good idea to replace your battery as well, since a battery that has been drained by a bad BMW 740i alternator is often unable to hold a charge as it used to.Find the battery and alternator you need in our convenient online catalogue.