Service Manual

XL Lawn Tractor Service Manual 5 - 1
ELECTRICAL SYSTEM
Electrical System
The electrical systems in all the XL Lawn Tractors are
similar when starting the tractor. Two things happen
when turning the ignition switch to the “START”
position. (1) Current will flow from the ignition switch
through the PTO (Power Take Off) switch, the clutch/
brake switch and to the coil of the starter solenoid. The
solenoid is actuated by the coil, connecting the starter
motor to the battery. To have this circuit completed,
the mower deck must be disengaged (PTO switch) and
the clutch/brake pedal must be depressed. (2) At the
same time, with the ignition switch in the “START”
position, current will flow to the relay, which activates
and takes the engine magneto ground wire off of
ground to allow the engine to have spark.
Once you have the tractor running, you can now
engage the mower deck only if you are in the seat,
activating the seat switch. Anytime you vacate the seat
with the mower engaged (or the brake pedal released),
the seat switch will open and cut off voltage to the
relay, which will deactivate and ground the engine
magneto and stop the engine. If you vacate the seat
with the PTO disengaged and the park brake engaged,
the engine will continue to run.
The following electrical section covers most of the
electrical components used on the XL Lawn Tractors.
It covers each electrical component’s purpose, how it
works, testing procedures, and location on the tractor.
To help you further to troubleshoot electrical problems,
the Riding Products Electrical Demystification Guide,
Form # 492-4509, is available with complete wiring and
circuit diagrams to help diagnose electrical problems.
Relay
Purpose
The relay (or kill relay) is in the safety circuit and the
Key Choice™ Reverse Operating System. When
applying current to this relay, it will keep the engine
magneto wire off of ground, which will allow the engine
to run. When the safety circuit or the Reverse
Operating System interrupts the current to the relay,
the engine magneto wire will ground and stop the
engine.
Location
The relay is located under the gas tank (Figure 174).
Figure 174
mvc-672
How It Works
A relay is an electrically actuated switch.
1. Coil: Terminals 85 and 86 are connected to a coil.
Applying 12 volts to these terminals energizes the
coil turning into an electromagnet.