April 5, 2026: LEMON Manuals is launched! Read the announcement.

Testing Generator Without Regulator (Quick Check)

Disconnect both leads (D+ and DF) from generator. Connect terminal DF of generator to ground (D-).
Connect positive lead of voltmeter to large connector (D+) of generator and the negative lead to the D-terminal.

Run generator briefly at the following speeds. The voltage supplied by the generator must be as follows:

RPM 6V	Units	12V Units
1500	6V	12V
3000	18V	36V

VOLKSWAGEN GENERATOR & REGULATOR SPECIFICATIONS

VW Part No	Reg. Part No	Nominal Data			Cut-in Speed RPM	Cut-in Voltage	Return Current Amps	No-Load Reg. Voltage	Load Reg. Voltage	Load Current Amps.
VW Part No	Reg. Part No	Max. Amps.	Mean Reg. Volts	Output RPM	Cut-in Speed RPM	Cut-in Voltage	Return Current Amps	No-Load Reg. Voltage	Load Reg. Voltage	Load Current Amps.
113 903 021C	113 903 801C	45	6.8	2400	1500	6.2-6.8	2.0-9.0	7.4-8.1	6.4-7.3	34
211 903 031	211 903 803	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
211 903 031A	21 1 903 803B	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
113 903 031G	113 903 803E	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
211 903 031	211 903 803	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
211 903 031A	211 903 803B	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
113 903 031G	113 903 803E	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
211 903 03 ID	211 903 803E	38	14	2000	1300	12.5-13.2	5.0-11.5	13.5-14.2	12.9-13.6	35
311 903 031E	211 903 803 and B	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45
311 903 031F	113 903 803E	30	14	2000	1450	12.4-13.1	2.0-7.5	13.5-14.5	12.8-13.8	45

If the generator supplies no voltage or too little voltage, it must be removed and checked.

Fig 1: Testing Generator Without Regulator
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.