LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson

Electrical Troubleshooting Procedures LTC Repair
6.8 Checking Generator Voltage at the Short Terminal Strip
See Graphic: wc_gr003517
WARNING
Electric shock hazard. Only qualified personnel should conduct this
test.
A quick way to check the function of the generator is to check the
voltage at the short terminal strip (a). If the correct voltage is present,
problems with the lights not functioning will be associated with the
circuit from the short terminal strip to the lights and not with the
generator.
To check the voltage at the short terminal strip, carry out the following
procedure:
6.8.1 Turn off the lights and shut down the machine.
6.8.2 Remove the screws that secure the control panel cover to the control
box. Remove the control panel cover and place it securely on the
fender of the trailer so it will not fall when the engine is started.
6.8.3 Place all circuit breakers in the OFF position and start the engine.
6.8.4 Using the AC volt scale on a multimeter, measure the voltage across
the wires labelled “1” and “2”. Also measure the voltage across the
wires labelled “3” and “4”. There should be 120V±10% measured in
each position.
If 120V±10% is measured, the generator is functioning properly.
If 120V±10% is not measured, check the resistance of the stator
windings. See section Checking the Stator Windings.
6.8.5 Measure the voltage across the wires labelled “1” and “4”. There
should be 230V±10% measured.
If 230V±10% is measured, the wiring to the short terminal strip is
functioning properly.
If 230V±10% is not measured, repair the jumper across the terminals
where wires “2” and “3” are connected.
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