Cub Cadet 900 series Professional Shop Manual

ELECTRICAL SYSTEM
123
6c. Take a methodical approach to finding the
problem. As a rule of thumb, start at one
end of the circuit and work to the other.
6d. The next step is to decide what method to
use to troubleshoot the circuit.
• If checking a safety circuit that grounds the mag-
neto, use an Ohms meter to test for continuity.
• If checking a safety circuit that enables a starter
motor or accessory, us a volt meter to confirm the
presence of power at each junction in the system.
• If a circuit does not work at all, look for a short or
an open.
• If the circuit works slowly or intermittently, look for
resistance by doing a voltage drop test.
NOTE: In all diagnosis, it is very important to
understand the circuit that is being checked. The
use of a schematic is recommended, even if a
technician is thoroughly familiar with the system.
7. Testing for opens/shorts
NOTE: When checking circuits for continuity, dis-
connect the circuit at the nearest plugs and use
the metal terminals of the plug as a connection
point for the test probes. DO NOT STAB THE
WIRES.
NOTE: When checking circuits for voltage, back-
probe the terminals nearest the point to be
checked. DO NOT STAB THE WIRES.
See Figure 7.45.
7a. Starting with a fully charged battery and bat-
tery cable connections that are clean and
tight, measure the battery voltage.
See Figure 7.46.
7b. With the circuit energized, start at either
end of the circuit and check for voltage.
• If starting at the battery-end of a powered circuit,
trace it through until power vanishes.
• If starting at the far end of a powered circuit, trace
it through to the point that power appears.
• If there is low voltage at the far end of the circuit,
do a voltage drop test (as described later in this
section) on the circuit to find the source of resis-
tance.
NOTE: When working toward the battery, check
each junction with the connector disconnected,
then re-check with the junction reconnected. If
there is voltage with the connector unplugged but
not when it is connected there is a short between
that point and the last connector tested.
NOTE: When working toward the battery, if one
junction has lost power, but the next connector
has voltage with its junction still connected, there
is an open between the two junctions.
8. Continue checking each connector until the other
end of the circuit is reached or the fault is found.
Figure 7.45
Figure 7.46

Cub Cadet 900 series Specifications

General

Brand	Cub Cadet
Model	900 series
Category	Tractor
Language	English