Toro VACU-POWER Service Manual page 71

Starter Motor Testing: (cont'd)
no problem is readily apparent, the cause may be a
broken winding. In this case, replace the starter motor.
NOTE: Because of the orientation of the connectors,
the starter motor will turn backwards when connected
directly to a Key-Lectric battery.
Figure
117
Alternator Testing:
Disconnect the red wire coming from the alternator.
Check the voltage output of the alternator with the.
engine running. Do this by connecting the positive test
lead to the red wire and the negative test lead to
ground (engine block). The voltage should be between
8.5 and 10.5 volts with the VOM set to DC volts. I f not,
use the following test for proper ground.
Check to insure that the alternator
is
properly
grounded by testing the resistance between the
alternator chassis and the engine block. See Figure
118. The resistance should be near zero. I f not, remove
any obstructions causing poor ground.
The alternator uses a diode to convert alternating
current to direct current. Since the diode is a "one way
valve',
it
can be checked by testing its resistance with
a VOM in both directions. In one direction, its
resistance should be very high, and in the other
direction, the resistance should be very low.
Figure 118
Charger Testing:
Test the auxiliary charger with a VOM. With the charger
plugged into a receptacle that is known to be good,
the voltage across the two output terminals should be
between 8.5 and 10.5 volts with the VOM set on DC
volts. If not, check for broken wires. If no defect can be
found, replace the charger as there are no user
serviceable parts inside. See Figure 1 19.
Figure 119