Generator

Figure 51-12.

E. TESTING VOLTAGE CONTROL UNIT SETTING (FIG. 51-12)

1. Move positive voltmeter lead to regulator "BAT" terminal.

2. Move field control lead from ground on motorcycle to regulator field terminal.

3. Turn field control variable resistor to "Direct" position.

4. Operate engine at 2700 RPM, (approximately 45 MPH).

5. Turn field control variable resistor to "Open" position, then to "Direct" to cycle regulator. Observe voltmeter reading.

6. If voltmeter reading is not within specifications (see 51-1), replace or adjust regulator according to manufacturer's Service Bulletin.

METHOD II TESTING BOSCH REGULATORS (VAT 26 TESTER)

12 VOLT SYSTEM WITH OR WITHOUT BATTERY Covers 1965 Sportster Models XLH and XLCH

A. TESTER CONTROLS

Turn ground polarity selector to Negative; load control knob to Direct; ammeter selector to 100A position; and voltage selector to 12 volt position.

B. TESTER CONNECTIONS (SEE FIG. 51-13)

1. Remove wires from regulator "B+" terminal. On XLH models, connect these wires together.

2. Connect Regulator lead "R" of tester to regulator terminal "B+"

3. Connect Ground lead "G" of tester to ground on motorcycle.

4. Connect Positive voltmeter lead to regulator terminal "D+" and connnect Negative lead to ground on motorcycle.

5. Remove wire from regulator terminal "DF" and connect this wire to a lead of the field control variable resistor. Connect the other lead of the field control to ground on motorcycle. Turn field control to "Direct" position. Turn load control to "Direct" position.

Battery lead "B" of tester is not connccted for this test.

C. TESTING GENERATING SYSTEM

1. Operate engine at 2700 RPM (approximately 45 MPH).

2. Slowly rotate load control clockwise until a reading of 10 amperes is observed.

3. If a reading of 10 amperes is obtained, generator is not at fault and difficulty is due to a faulty regulator or defective wiring. Inspect wiring and make Tests D and E.

4. If a reading of 10 amperes cannot be obtained and voltmeter reading is below 12 volts, generator is defective.

5. If no reading is obtained on ammeter but voltmeter reading is 15 volts or higher, cutout relay is defective. Regulator should be replaced and circuit retested.

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