Harley Davidson (1970 to 1978) Sportster XL/XLH/XLCH/XLT-1000. Service manual — page 14

REGULATOR - 1977 & EARLIER

GENERAL

Two unit voltage regulators and three unit current and voltage regulators are used to control generator output to the electrical system.

Normally the regulator does not require attention at regular service intervals; however, point cleaning, point setting and air gap adjustments may be necessary if regulator is not functioning correctly.

Four basic tests are required:

1. Test the generating system to determine whether the generator or regulator is at fault.

2. Test the cutout unit closing voltage

3. Test the voltage control unit setting.

4 Test the current control unit setting.

Voltage and current settings for regulators are listed in

following table of specifications.

Before making any checks or adjustments, the charging circuit must be operated approximately 15 minutes to bring regulator to normal operating temperature. Regulator cover and gasket must be in place.

Two methods are used for making regulator tests, the method used depending upon the type of equipment available.

METHOD I employs separate voltmeter, ammeter, fixed resistances of 1/4 ohm and 1-1/2 ohm. and 25 watt variable field resistor. This is the method outlined in detail in the Delco-Remy Service Bulletins.

METHOD II employs single test instrument incorporating the same components as Method I. and in addition has a variable load resistance. The equipment used is a VAT 26 voltage-ampere tester manufactured by the Sun Equipment Corporation.