Cub Cadet Z-Wing - Manual (Page 84)

Cub Cadet Commercial Z-Wing
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36. RESISTANCE
36.1. Electrical resistance in the wiring harness of this
mower can cause a variety of problems:
• Hard starting
• Insufficient charging of the battery
• Slow wing lift action
• PTO “fall-out”
36.2. Ohms, represented by the symbol Ω is a mea-
sure of electrical resistance. Ohm’s law defines
the relationship between volts (pressure), amps
(electron flow), and ohms (resistance) as:
1 volt = 1 amp X 1 ohm.
36.3. While it is typical to state resistance in terms of
ohms, there is another means or measuring the
actual effects of resistance that is more useful
for the diagnosis of electrical problems.
36.4. To illustrate why ohm measurement can be mis-
leading for a technician, a resistance reading on
a short length of 14ga wire is 0.00.
See Figure 36.4.
36.5. That resistance reading does not change much
as the individual strands are whittled-away.
See Figure 36.5.
• In this illustration, indicated resistance in the
wire did not change until all but two copper
strands were cut.
• While the indicated resistance does not change,
but the current-carrying capacity of the wire
does.
• It is the current-carrying capacity that effects the
electrical performance of the mower.
36.6. A more relevant measure of the effects of resis-
tance is called “voltage drop”, and it is easily
measured using a DVOM set to read D.C. volts.
Figure 36.4
Figure 36.5
Minimal Ohm
reading
All but 2 strands
have been cut