Prelude L4-1955cc 2000 (1987)
Voltage Regulator: Testing and Inspection
Fig. 2 Voltage regulator test connections. W/carbureted engine
1.
On Accord models, remove relay box attaching bolts, then the box.
2.
On all models, remove regulator. Leave 6 terminal wire connector attached to regulator.
3.
Using a suitable voltmeter, measure voltages between regulator E (black wire) terminal and each terminal of the 6 terminal wire connectors, Fig. 2.
Results should be as follows:
a. With ignition Off, battery voltage should exist at B and F terminals. All other terminals should have 0 voltage.
b. With ignition ON, battery voltage should exist at IG terminal and 9-11 volts should exist at F terminal. All other terminals should have 0
voltage.
c. With engine running at idle, charging system voltage should exist at B, IG and L terminals, P terminal should have approximately 7.5 volts
and F terminal should have 5-7.5 volts.
d. With engine running at 1000 RPM, measure voltage at terminal F. Voltage should be approximately 9 volts. Raise engine speed to 2000
RPM, voltage at terminal F should increase to 11 volts. Raise engine speed to 3000 RPM, voltage at terminal F should increase to 12 volts.
4.
If measurements do not fall within the specifications above, check for loose harness coupler, broken wires or blown fuse.
5.
If voltage during test 3d is out of specifications, replace regulator.
W/Fuel Injected Engine
1.
Ensure alternator belt is properly adjusted, connect suitable voltmeter across battery terminals, then start engine and observe no load voltage.
2.
If reading is greater than 15.1 volts, proceed as follows:
a. Remove alternator, then remove rear end cover and brush holder from alternator.
b. Check continuity between each rotor slip ring and alternator case.
c. If continuity exists, alternator is defective. If no continuity exists, regulator is defective.
3.
If no load voltage is approximately 12 volts, proceed as follows:
a. Stop engine and ensure B+ terminal at alternator (large diameter wire secured by stud and nut) is properly connected.
b. Disconnect plug on electrical connector from alternator.
c. With ignition on, check for voltage at black/yellow wire terminal in connector.
d. If no voltage is present, check circuit between connector and fuse no. 4 and repair as needed.
e. If battery voltage is present, check for defective voltage regulator, rectifier or stator and repair as needed.
