Polarizing Generator

When installing a new or rebuilt generator or after overhaul of a unit, it must be polarized prior to starting the engine. This is done by letting the generator run briefly as a motor to give pole shoes the necessary residual magnetism of the correct polarity for excitation. Polarize the generator using one of the following methods (with fan belt removed):

1. Connect lead from negative battery post to D- terminal on generator (see illustration). Momentarily contact lead from positive battery post to D+ terminal on generator. Generator is now polarized and ready for testing.
2. With regulator connected to generator, momentarily contact lead from positive battery post to D+ terminal on regulator.
   NOTE: Never polarize by connecting 8+ terminal on regulator to D+ terminal on regulator as damage may result to regulator and generator.

   Generator is now polarized and ready for testing.

   Fig 1: Polarizing Generator

   Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
   BOSCH GENERATOR SPECIFICATIONS
   
   

   Bosch Part No.	Rating	No Load RPM For Voltage Rating	Output Test		Load Setting Amps.	Field Winding Ohms + 10%
   			Cold RPM	Hot RPM
   0 101 302 111	14V30A20	1450	1900	2100	20	3.5