TP-6137 5/0356 Section 9 Generator Troubleshooting
Alternator Troubleshooting and Corrective Action
Problem Possible Cause Corrective Action
No output Low revolving speed Check and adjust the revolving speed.
Incorrect connections Check the wiring diagram and reset the
connections.
Inoperative capacitor Replace the capacitor.
Winding breakage Check the winding resistance and
replace the damaged parts.
Rotating diode(s) damage Check and replace the diode(s).
Low no-load voltage Low revolving speed Check and adjust the revolving speed.
Rotating diode(s) damage Check and replace the diode(s).
Capacitor with low capacity Increase the capacitor capacity.
Winding breakage Check the winding resistance and
replace the damaged parts.
High no-load voltage Capacitor with high capacity Reduce the capacitor capacity.
High speed Adjust the revolving speed.
Correct no-load voltage but low
Rotating diode(s) damage Check and replace the diode(s).
voltage at load
Low speed at full load Operate on the speed governor.
Load too high Reduce the voltage supplied
Unstable voltage Uneven rotation Check the engine
Poor connection contacts Check the wiring diagram and reset the
connections.
Uneven load Check the load and eliminate the
uneven loads.
Unit is noisy Poor coupling Check and correct the coupling.
Short circuit in winding or load Check windings and loads and replace
the damaged parts.
Bearing breakage Replace the broken bearing
9.7 Alternator Excitation
As a result of disassembling the generator set, the
alternator can get deenergized. It is then necessary to
excite the alternator (after reassembly to the engine) by
applying 12 volts DC to the line terminals. Connect in
series a 10 amp, 250 volt fuse to the positive wire going
to the battery. See Figure 9-10.
Figure 9-10 Alternator Excitation
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