Cub Cadet 1000 SERIES Service Manual page 86

Series 1000 and 1500
39.21. As an example, if the starter solenoid does not
engage properly, check for voltage drop between
the ground point for the starter solenoid and the
negative post on the battery. See Figure 39.21.
Figure 39.21
39.22. With the starter engaged, this machine exhibited
a voltage-drop reading beyond 0.30 volts, indi-
cating a poor ground connection.
39.23. A similar ground-side test on a tractor with a
slow-cranking starter motor can be conducted
between the engine block and the negative bat-
tery post. See Figure 39.23.
Figure 39.23
39.24. With the starter engaged, this machine exhibited
a voltage-drop reading beyond 0.30 volts, indi-
cating a poor ground connection.
39.25. Individually, these readings should lead a techni-
cian to inspect the connection between the sole-
noid and the ground path (e.g. mounting
hardware, green wire with eyelet beneath head
of solenoid mounting bolt), or the engine and the
frame (e.g. loose or rusty engine mounting
bolts).
39.26. If both of these readings were found on the
same tractor, a common point in the system
would be the primary suspect (e.g. poor connec-
tion between negative battery cable and frame).
39.27. Applying this principle to the positive side of the
system: See Figure 39.27.
• Ultimately, any positive current should find its
way from the positive post of the battery to its
destination through the wiring harness.
• To check hot-side voltage drop: set-up a multi
meter to measure 12V DC.
• Make a good electrical connection between the
red (+) probe and the positive post on the bat-
tery.
• Make a good electrical connection between the
black (-) probe and the suspect point of the cir-
cuit.
• Power-up the circuit in question.
• The voltage that shows-up on the meter is the
power that is not following the intended path
back to the negative battery post.
• Voltage drop on a good circuit should be less
than 0.1 volts. A voltage drop reading on the
meter of greater than 0.2 volts indicates a fairly
substantial problem that demands attention.
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Figure 39.27