Cub Cadet ISeries - Manual (Page 117)

ELECTRICAL SYSTEM
111
Introduction
This chapter is divided into four sections:
• Section 1: About this chapter and precautions
• Section 2: Components
This section will describe the location and opera-
tion of the electrical components on the tractor.
Where appropriate, some disassembly or com-
ponent removal instructions will be included.
• Section 3: Diagnostic Techniques
This section will cover basic tools, techniques,
and methodology for diagnosing electrical issues
on the tractor. A lot of the information in this sec-
tion can be applied to other equipment.
• Section 4: Schematics
Precautions
! CAUTION ! CAUTION
Before disconnecting any electrical
component, take precautions to pre-
vent the component or the wires
attached to it from shorting out. The most effective
means of doing this is to disconnect the battery ground
cable from the negative battery terminal.
! CAUTION ! CAUTION
Unless performing tests that require
the electrical system to be in opera-
tion, disconnect the negative cable
from the battery before doing any work to the electrical
system of the tractor.
Components
The I-series tractors have the Cub Cadet Rev-Tek
system..
1. RMC Module
The RMC module contains electronic logic cir-
cuits. When diagnosing anything that is connected to
the RMC module, a high impedance test light or a high
impedance digital volt-ohm meter (DMMDMM) must be
used. The amperage draw of a standard incandescent
test light may over-burden some internal electronic cir-
cuits, burning-out the module.
NOTE: These tools are not outrageously expen-
sive or exotic. High impedance test lights (Thex-
ton model 125 is typical) can be purchased
locally from stores like NAPA for under $30.00.
Appropriate multi meters can be purchased for
under $100.00, and are an invaluable tool for
any competent technician.
• It is typical when industries shift from electro-
mechanical to electronic controls that diagno-
sis shifts from tracing through a number of inde-
pendent circuits to checking the in-puts to and
out-puts from a central processor. This is similar
to, but much less complex than the transition
that the auto industry made with the conversion
to fuel injection in the 1980s.
NOTE: The starter safety circuit has no con-
nection to the RMC module.
• The safety circuits that are capable of turn-
ing-off the engine work through the RMC mod-
ule.
• It is still important to be familiar with the workings
of the individual components of the electrical
system, but some of them can now be checked
from a central point on the tractor. This
makes life easier on the technician, frequently
making it unnecessary to connect to difficult to
reach switches in the preliminary stages of diag-
nosis.
• The function of individual safety switches can be
seen as providing information “inputs” to the
RMC module.
• The next part of this section gives a detailed
description of the electrical components on
this tractor, their function in the system, and their
physical location on the tractor. Armed with this
CHAPTER 7: ELECTRICAL SYSTEM