Pennsylvania Code › Title 67 - TRANSPORTATION › Part I - Department of Transportation › Subpart A - Vehicle Code Provisions › Article VII - Vehicle Characteristics › Chapter 175 - VEHICLE EQUIPMENT AND INSPECTION › Subchapter O - VEHICLE SUN SCREENING DEVICES › Appendix B - MOTORCYCLE AND MOTOR VEHICLE CYCLE ELECTRICAL SYSTEM (MAINTENANCE OF DESIGN VOLTAGE)-SAE J392

Current through Register Vol. 54, No. 28, July 13, 2024
SAE Recommended Practice
1. Purpose-This SAE Recommended Practice provides
						  minimum illumination voltage values for motorcycle and motor-driven cycle
						  electrical systems and accompanying test procedures. (Note: Wherever the word
						  "motorcycle" appears in the report, it is understood to include "motor-driven
						  cycle.")
2. Scope-This recommended practice pertains to both
						  battery-equipped and batteryless motorcycle electrical systems.
3. Test Apparatus:
3.1. Voltmeter-0-20 V maximum full-scale deflection,
						  accuracy +1/2% (two voltmeters required).
3.2. Ammeter-Capable of carrying full system load
						  current. Accuracy +3%FS.
3.3. Means for Measuring Engine RPM-Accuracy
						  +3%.
4. Test Procedure.
4.1. Install fully charged original equipment battery
						  on the motorcycle (if motorcycle is battery equipped).
4.1.1. Battery temperature to be 80 + or -10F.
4.2. Connect one voltmeter between the headlamp low
						  beam terminal and the ground; connect the other voltmeter between the tail lamp
						  terminal and the ground.
4.3. Connect the ammeter in series with the battery.
						  (Note: Disregard paragraph 4.3 for batteryless machines.)
4.4. Start engine and turn on headlamp(s).
4.4.1. Switch headlamp to the low beam position.
4.4.2. External fan cooling may be applied to the motor
						  cycle engine.
4.5. Run the engine at an rpm equivalent to 30 mph in
						  top gear for 10 minutes.
4.5.1. Record the lowest and highest headlamp voltage
						  and tail lamp voltage observed during the 10 minute period.
4.6. Increase speed to manufacturer's suggested maximum
						  rpm.
4.6.1. Record the highest and lowest headlamp and tail
						  lamp voltages observed during a 5-second period.
4.7. Run the engine at manufacturer's rated idle speed
						  for 10 minutes.
4.7.1. Record the lowest and highest tail lamp voltage
						  observed during the 10 minute period.
4.7.2. Record the lowest and highest headlamp voltage
						  observed during the 10-minute period.
4.8. Slowly increase the engine speed until generating
						  equipment cancels the system load, indicated by "0" reading on the ammeter.
						  (Note: Disregard paragraph 4.8 for batteryless motorcycles.)
4.8.1. Record the engine rpm at ammeter zero
						  point.
5. Test Limits:
5.1. Voltages recorded in paragraphs 4.5.1, 4.6.1 and
						  4.7.1 shall be between 80% and 120% of the rate headlamp design voltage.
5.2. Voltages observed in paragraph 4.7.2 shall be
						  between 40% and 120% of the rated headlamp design voltage.
5.3. Engine rpm observed in paragraph 4.8.1 shall be
						  less than the motorcycle equivalent speed at 30 mph in top gear operation.
(Report of Motorcycle Committee and Lighting Committee
						  approved December 1969. Editorial change November 1971.)
This appendix cited in 67 Pa. Code §
														175.146 (relating to lighting and
							 electrical systems).