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TROUBLESHOOTING & REPAIR
F-45 F-45
RANGER 305D
ROTOR VOLTAGETEST (continued)
10. If the meter reading indicates battery
voltage, about 12 to 14 VDC, the rotor
may be open, or the brushes may be faulty
or not making proper contact with the slip
rings. Perform the Rotor Resistance Test,
and Brush and Slip Ring Service
Procedure.
11. If the voltage measures about 3 to 5
VDC, the generator is not building-up to
normal output even though the flashing cir-
cuit appears to be functioning normally.
This condition could be caused by one of
several failed components or connections.
Continue with the following test.
12. Check the field bridge rectifier, (D3) and
capacitor (C3); also check the wiring and
terminals connecting them. See the wiring
diagram.
13. Perform the Rotor Resistance Test.
14. Perform the Stator Short Circuit and
Ground Test.
15. When the Stator short circuit and ground
test has been completed, reconnect leads
#7 and #9 to the field bridge rectifier, (D3).
All other stator leads should remain discon-
nected and isolated at this time.
16. Be sure that there are no leads of any kind
across any of the stator windings, except
the #7 - #9 winding. Examine stator wiring
for damage, pinched leads, chafed insula-
tion, etc. If necessary,disconnect and iso-
late the stator output leads as close to the
starter as possible. See wiring diagram.
17. All of these disconnected leads should be
insulated, and/or positioned so they cannot
come in contact with any other wiring or
chassis ground and cannot be damaged by
moving parts when the engine is running.
18. Re-start the machine and measure the
rotor voltage.
19. If rotor voltage continues to read signifi-
cantly lower than 50 VDC, the Stator is
probably defective and should be replaced.
Note: The field bridge rectifier and field capac-
itor may appear to function normally when test-
ed independently, but may malfunction when
placed under the stress or normal operation.
For this reason, It is recommended that the
bridge rectifier and the capacitor be replaced
with known good components before replacing
the stator.