Electric Unit – Charging System Bosch 14V 35A Altenator

This Manual, supplied to all authorised ALFA ROMEO Repair Shops, contains instructions for the overhaul and recondi- tioning of the BOSCH K1 (RL) 14V 35A2Û alternator. The operations are amply illustrated so that the detail and unit concerned can be quickly identified and the tools to be used and the correct method of operation can be seen. Only genuine spares should be used if any assemblies or parts have to be replaced; only in this way can complete interchangeability and fully satisfactory performance be guaranteed. This Manual should be kept continuously up-to-date by the addition of new information and instructions issued at intervals by the Technical Service Division in the regular Information Sheets.

CHARGING CIRCUIT REGULATOR OPERATING PRINCIPLES CONSTRUCTION
The alternator output ¡s regulated by a resistance inserted in the alternator field circuit by the regulator. Such a resistance is connected across the regulator terminals D+ and DF. The armature is under the tension of a spring which holds the points together for contact with the terminal D+ until it is overcome by the magnetism of the regu- lator winding parallel connected to the alternator terminals D+ and D-

OPERATION
When the alternator starts, the output voltage is lower or barely attains 12 volts. Thus, full current flows from terminal D+ through armature points to the alternator field winding (DF). As the alternator output increases the magnetism in the regulator winding also increases. When the voltage for which the regulator is set (about 13.8 volts) has been reached, the armature is pulled toward the core and the D+ points separate. The current bypasses the air gap between points and, flowing through the resistance in the alternator field circuit (a small part also flows back through the armature which is grounded via the other sets of points now closed) causes the alternator output to drop. As a consequence, the magnetic strength in the winding more also drops thus permitting the armature spring to pull the armature away from the core and the D+ points to close again. The entire sequence is repeated more or less rapidly according to the alternator RPM. The regulator is factory set; therefore, if any trouble is experienced, do not attempt to repair the regulator but replace it with a new one….

Download ELECTRICAL UNITS: CHARGING SYSTEM BOSCH K1 (RL) 14V 35A 20 ALTERNATOR