Checking Keyswitch And Wiring - WACKER Group LTC 4 Repair Manual

Lombardini Engine Troubleshooting
5.3

Checking Keyswitch and Wiring

See Graphic: wc_gr003228
WARNING
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
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Electric shock hazard. Only qualified personnel should conduct these
tests.
When troubleshooting Lombardini engines that do not crank, check
that the B (black) wire (a) is connected to the starter solenoid.
Remove the screws securing the control panel (b) to the mounting
bracket and remove the control panel from the bracket.
Remove the back cover (c) of the control panel box and check that the
the wiring to the keyswitch (d) is clean and tight. Check that the
appropriate wires are connected to the proper terminals of the
keyswitch.
Check for 12V (battery voltage approximately 12) between terminal 30
of keyswitch and ground. If no voltage is measured, repair wiring back
to battery. If voltage is measured, continue.
Place the keyswitch in the START position and check for 12V (battery
voltage) between terminal 50 of the keyswitch and ground. If no
voltage is measured, replace the keyswitch. If voltage is measured,
continue.
Place the keyswitch in the START position and check for 12V (battery
voltage approximately 12) between the B (black) wire (a) and ground
at the starter solenoid. If no voltage is measured, repair the wiring
between terminal 50 of the keyswitch and the starter solenoid. If
voltage is measured and the engine still won't crank, there is a problem
with the starter motor. See the Lombardini engine repair manual for
further information.
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LTC Repair