Generator specifications (BMW 5 Series E12)

On BMW "518", "520" and "520i" of the first model years were equipped with a three-phase alternator of the Bosch brand with a built-in rectifier unit and electronic voltage regulator, and on the "525" and "528" - with a separate voltage regulator.

Generator specifications

* The same characteristics are found in the BMW "520" generator with automatic transmission, starting with chassis No.3 800 337

Since the 1978 model year, the BMW "525" and "528" have been equipped with a generator with catalog number 0 120 489 650 instead of the generator with catalog number 0 120 489 610, the maximum rotor speed of which is 15,000 rpm.

The 528i model cars were equipped with a Bosch generator, part number 0 120 489 621, with a built-in voltage regulator and the following characteristics:

• rated voltage, V: 14;
• maximum output current, A: 65;
• maximum power at 14 V and maximum output current, W: 910;
• rotor speed at the moment the charging current starts to flow to the battery, rpm: 1060.

The drive belts of these generators are V-belts, small width, size 12.5x606 LA.

Since the 1978 model year, the following brands of noise suppression capacitors have been installed:

• "525": Vega 0 310 024 015;
• "528": Bosch 0 290 800 036;
• "528i": Bremicker 4066.

Control voltage, V:

• Vegi and Bosch: 150;
• Bremicker: 200±20.

Capacity, μF:

• Beru: 2,2;
• Bosch and Bremicker: 2.2±20%.

Since the 1980 model year, all models of vehicles were equipped with Bosch brand generators with a built-in voltage regulator.

Generator characteristics

Since the 1982 model year, the BMW "520i" was equipped with a generator with the catalog number 0 120 489 718, and the "525i" and "528i" - with the number 0 120 489 029.

• Nominal voltage, V: 14.
• Maximum output current, A: 65.
• Maximum power, W: 910.
• Maximum rotor speed, rpm: 15000.
• Capacity of the noise suppression capacitor, μF: 2.2±20%.

Generator drive belt

The generator is driven by a V-belt of the Ventiflex 1108 brand (9.5x875) "518", "520"; ventifiex 1112 (9.5x975) brand on the "520i" model; brand Aatbelt 2212 DA (12.5x1060) on "525", "528".

Since the 1980 model year, the BMW "520" used a belt with dimensions 9.5x950.

Voltage regulator ("525", "528")

Brand: Bosch AD 1/14 V.

Nominal voltage. V: 12.

Working voltage, V: 14.

Output current A/at rotor speed, rpm: 35/2700.



Adjustable voltage range at 20°C, V: 13.5-14.2.

Maximum excitation current, A: 3.

Since model year 1978 on BMW "525", "528" and "528i" was equipped with a built-in generator voltage regulator of the Bosch brand, catalog No.0 192 052 004, type EE 14 V 3.

Adjustable voltage, V: 14.1.

Adjustable voltage limits, V: 13.7-14.5.

Since the 1980 model year, the regulated voltage limits at 2000 rpm on all model vehicles are 13.5-14.6 V.

Since the 1982 model year, the BMW "520i" was equipped with a Bosch voltage regulator, part number 0 192 052 006, and the "525i" and "528i" were equipped with a regulator with part number 1 197 311 004, the adjustable voltage limits of which remained the same.