Car starter and alternator BMW 5 Series E28

General information about the charging system and precautions when working with it
There are two types of generators installed on these models: Bosch and Motorola. There are also three different current levels: 65A, 80A and 90A. The serial...

Checking the charge system
1. If there is a malfunction in the charge system, do not immediately conclude that the problem is in the generator. First of all check the following: Check...

Removal and installation of the generator
If your vehicle's radio is equipped with an anti-theft system, make sure you know the correct activation code before disconnecting the battery. Before...

Replacing the voltage regulator
The voltage regulator controls the charging system by limiting the alternator output voltage. The regulator is a sealed unit and cannot be adjusted. If the...

Checking and replacing the generator brushes
If your vehicle's radio is equipped with an anti-theft system, make sure you know the correct activation code before disconnecting the battery. Before...

General information about the engine starting system and precautions
The sole function of the starting system is to crank the engine fast enough to start. The starting system consists of a battery, a starter, a starter traction...

Checking the starter on a car
Before diagnosing the starter, make sure the battery is fully charged. 1. If the starter does not rotate at all when the ignition key is turned, make sure the...

Removal and installation of a starter
If the starter is defective, it should be replaced or sent to an auto electrician for repair. Overhauling the starter at home is impractical, even if spare...

Removal and installation of the traction relay
Withdrawal If your vehicle's radio is equipped with an anti-theft system, check before disconnecting the battery. that the correct activation code is known....

Diagnostics of malfunctions of the start and charge system
Symptom Possible reason Battery not "keeps" charge The alternator drive belt is worn out, or the adjustment of its tension force is broken (see chapter Car...