Toro Lawn-Boy TimeCutter Z Service Manual page 148

How It Works
is wrapped around an iron core. Whenever 12 volts is
applied to the coil, it becomes a magnet. The other part
is a bar type switch. Because it has a large contact area
with the contact terminals, it can easily handle the high
current loads required by the starter motor of the engine.
When 12 volts is applied to the coil, it becomes an elec-
tromagnet. This quickly pulls the contact bar toward the
contacts and closes the switch. When power is removed
from the coil, the spring loaded bar returns to its
"normally open" position. The solenoid closes and opens
the switch very quickly. This minimizes the "arcing" that
can damage other types of switches.
The ignition switch is protected because only a small
amount of current is needed to activate the coil.
TimeCutter® Z/Precision® Z Service Manual
ELECTRICAL
Testing
1. Disconnect the solenoid from the wiring harness.
2. With a multimeter (ohms setting), check to ensure
that terminals "c" and "d" are open (no continuity).
3. Apply +12 VDC to terminal "a" and ground terminal
"b". Terminals "c" and "d" should now be closed
(continuity) (Fig. 435).
Fig. 435
4. You should be able to hear the solenoid switch
"click" when you make the connection (Fig. 436).
C
A
Fig. 436
A & B Coil terminals
xl solenoid
D
B
PICT-9803
C & D Contact terminals
7-3
7