Starter/Generator - Pioneer 1200 Maintenance Service Manual

11
TROUBLESHOOTING AND ELECTRICAL SYSTEM: FE400 ENGINE
Test Procedure 10 – Diode (Generator Circuit), Continued:
ANGLED
I-BEAM
4. With the multimeter set to the diode test function (
the white lead of the diode and the red (+) probe of the multimeter to the red lead of the diode
(Figure 11-37, Page 11-31). The reading should indicate an overload (no continuity). A diode is
designed to conduct current in one direction only. If a diode conducts current (shows continuity) with the
meter probes as described, the diode has failed and must be replaced. See Diode Removal,
Section 12, Page 12-12.
5. Reverse the multimeter probes and note the reading. With the black (–) probe of the multimeter to the red
lead of the diode and the red (+) probe of the multimeter to the white lead, the meter should read approx-
imately 450 mV, however, a range of 400-500 mV is acceptable (Figure 11-38, Page 11-31).
6. Connect either the black (–) or red (+) lead of the multimeter to the diode body (case). Connect the other
multimeter lead to both the red and white lead terminals of the diode. The multimeter should indicate an
'overload', (no continuity). If continuity reading does occur, it indicates that one or both of the diode leads
are grounded to the diode body (case) and the diode must be replaced. See Diode Installation,
Section 12, Page 12-12.
7. If the diode tests good, reconnect the diode leads. See Diode Installation, Section 12, Page 12-12.
See also following WARNING.
∆
WARNING
• Incorrect wiring could result in severe injury or death.
• Diode and solenoid connections must have correct polarity.
• Keep all persons clear of engine belts when making final connections.
Page 11-30 2003 Pioneer 1200/1200SE Gasoline Vehicle Maintenance and Service Manual
RIGHT
ANGLED
SUPPORT
PIONEER 1200 SE
3
2
1
3
OUTER
I-BEAM
Figure 11-36 Electrical Control Box and Diode Orientation
6
2
RED FROM
VOLTAGE
REGULATOR
RED FROM
DIODE
1
WHITE FROM
DIODE
RED FROM
BATTERY
ç
), connect the black (–) probe of the multimeter to
Test Procedures
5
Some wires
omitted
for clarity.
7
RED FROM
FUSE BLOCK
WHITE FROM
STARTER/
GENERATOR