7 Electrical System Service
General Information
7 - 4
Wiring Diagrams
Since it isn’t possible to include all wiring diagrams for
every year covered by this manual, the following
diagrams are those that are typical and most commonly
needed.
Checking Out the System
GENERAL
Both the ignition and charging systems are internal to the
tractor engine. Refer to Section 2, TROUBLESHOOTING,
or your engine manual for information. See an authorized
dealer or appropriate service manual for additional
engine troubleshooting information.
BASIC ELECTRICAL TERMS
“Ground” is the negative battery post or any other con-
ductive part of the frame. For best results, use the nega-
tive battery post as ground.
“VOM” is a volt-ohm meter, multi-meter, or equivalent.
“VDC” is volts of direct current or the VOM setting used
to measure DC voltage.
“Ohm” is units of resistance or the VOM setting used to
measure resistance.
“Continuity” is a continuous, unbroken circuit. In this
manual continuity is determined with a VOM set to mea-
sure ohm. Zero ohm is true continuity. However, due to
contact point corrosion and resistance within wires, conti-
nuity may measure a few ohm.
“No Continuity” is a broken circuit. In this manual no
continuity is determined with a VOM set to measure
ohm. No continuity will register as infinite ohm.
“Battery Voltage” is the approximate voltage output of
the battery. Keep in mind that “battery voltage” tested at
any component will be slightly lower than “battery voltage”
tested at the battery terminals due to resistance within
connections and wires.
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