Service Manual

Wh
Re
Re
Re
Re
Bk
10026
Fuse
(25 amp)
Battery
(12 volt)
A
B
Ignition Switch
(in "run")
Alternator
(15 amp)
Regulator
Rectifier
AC
AC
B+
Always start by selecting the proper
scale. For instance, on this meter we
selected the 25 volt scale.
Use the AC scales to measure
unrectified voltage straight from an
alternator or from a wall outlet.
Battery voltage is always D.C.
If you measure from ground to ground
or have an open circuit, your reading
will be 0.
Use D.C. scales to measure voltages
that have been changed to D.C. by a
rectifier or diode.
The ohmmeter is powered by an
internal battery. Replace it if the
needle will not move full scale.
The integrity of the ignition coils and
electric clutches can often be checked
using an ohmmeter.
Make sure your VOM reads 0 ohms
(full scale right) when the leads are
touching together to insure accurate
resistance readings.
Always disconnect components from
the circuit when resistance checking.
Otherwise you could get a false
reading. This switch should read
infinite ( ) resistance.
Do not use the ohmmeter to test Toro
interlock modules! The battery current
could damage the module.
2
Checking Resistance
Checking Voltage
Using a VOM
1
TIME SAVERS
Demystification Guide 2-7