New Holland LS140 Workshop Manual page 496

START INTERLOCK CIRCUIT
"SERVICE/RUN" switch in the "RUN" position.
The start interlock relay coil receives power from the
service/run switch, with the switch in the "RUN"
position through the W/LTGN wire. The interlock
receives power from the seat/seat belt plug when the
operator is sitting in the seat with the seat belt
buckled through the W/O wire.
SECTION 55 - ELECTRICAL SYSTEM
When the interlock is "satisfied" that the service/run
switch is in the "RUN" position and the operator is
sitting in the seat with the seat belt buckled, power
will travel through the W/DKBL wire to the start relay
and through the LTBL/O wire to the fuel solenoid,
allowing the engine to start. The source for the fuel
solenoid power is from key switch "Ign," then through
the O/PU wire to the cab 5-amp fuse, then via the O
wire to the relay.
55-71
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