TESTING ELECTRICAL COMPONENTS
Battery Powered Models
The electrical components in a battery powered model
are as follows:
A. Motor.
B. Solenoid.
C. Batteries.
D. Charger — includes indicator lights.
E. Transformer.
F.
Switch.
G. Wire harness.
H. Safety key terminals.
I.
Circuit breaker.
Motor Testing
Figure 36
36294102
There is one simple test that can be made on the
motor. Unplug the motor from the wire harness. Set
an ohmmeter on Rx1 and zero the meter. Attach one
test probe to each of the wires going to the motor and
note the reading. SLOWLY rotate the armature of the
motor and watch the tester. The needle should move a
little, but at no time should it go to the extreme ends of
the scale. There should be some resistance there at all
times. If the needle reads zero, there is a short circuit
in the motor and it should be replaced. If the needle
goes to infinity (looks like an 8 on its side) a wire inside
is broken or the brushes are not contacting the
armature. If you find a broken wire accessible and can
splice it, do so. If the broken area cannot be found or is
in an area where it cannot be spliced, the motor must
be replaced.
Terminals
Description
A - A
B - B
C - C
Normally closed terminals
Normally open terminals
Connections to coil
Disconnect the wire harness from the solenoid
terminals prior to performing this resistance test.
Connect an ohmmeter set on the RX1 scale to the coil
terminals as shown below. The coil resistance should
read between 46 and 55 ohms (Figure 37).
SPECIAL NOTE: If you rotate the armature too fast, it
will not only distort your readings, but could possibly
damage your tester. Remember when a permanent
magnet motor has its armature turned manually, it
becomes a generator.
Solenoid Testing
A solenoid is used to protect the switch from arcing
when it’s turned on and off (Figure 36).
Figure 37
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Measurement
Specification
Solenoid coil resistance
46 - 55 ohms
4
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Carefree Mower Service Manual
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