ELECTRICAL
8-5Toro GrandStand Service Manual
8
How It Works Testing
A & B Coil Terminals C & D Contact Terminals
The solenoid has two primary parts. One, a coil wire
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 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 “normal
open” position. The solenoid closes and opens the
switch very quickly. This minimizes the “arcing” that can
damage other kinds of switches.
The ignition switch is protected because only a small
amount of current is needed to activate the coil.
1. Disconnect the solenoid from the wire harness.
2. With a multimeter set to the ‘ohms’ setting, ensure
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. 1438).
4. You should be able to hear the solenoid switch
“click” when you make the connection (Fig. 1438).
Fig. 1438 IMG-1198a
A
C D
B
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