Lincoln Electric RANGER 305G EFI Service Manual page 38

LINCOLN ELECTRIC
13. If the voltage measures about 3 to 5 VDC, the generator is not building up to normal output even
though the flashing circuit appears to be functioning normally. This condition could be caused by
one of several failed components or connections. Continue with the following test.
14. Check the field bridge rectifier (D3) and capacitor (C3) and also check the wiring and terminals
connecting them. See Wiring Diagram.
15. Perform the Rotor Resistance And Ground Test Procedure (Static), the Rotor Resistance And
Ground Test Procedure (Dynamic).
16. Perform the Stator Short Circuit And Ground Test Procedure.
17. 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 disconnected and isolated at this
time.
18. 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 for damage, pinched leads, chafed insulation, etc. If
necessary, disconnect and isolate the stator output leads as close to the starter as possible. See
Wiring Diagram.
19. 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.
20. Re-start the machine and measure the rotor voltage.
21. If rotor voltage continues to read significantly lower than 50 VDC, the stator is probably defective
and should be replaced.
NOTE: The field bridge rectifier and field capacitor may appear to function normally when tested
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.
22. Perform the Case Cover Replacement Procedure.
Ranger® 305G EFI Service Manual
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