37
WIRE GAUGE: The proper thickness of wire is
necessary in all electrical circuits. Wire diameter is
measured in increments of gauge numbers. As the
gauge number of the wire increases, the wire diameter
decreases in size (diag. 6).
1. The starter circuit wiring must be rated at #6 or
lower gauge number.
2. The charging circuit wiring must be rated at #16
or lower gauge number (20 amp system requires
#14 or lower gauge number).
3. The magneto circuit wiring (ground circuit) must
be rated at #18 or lower gauge number.
THE LARGER THE NUMBER THE SMALLER THE WIRE
# 18
# 6
6
Tecumseh Products Company's standard wiring color codes effective August, 1992 are as follows:
Code Product
Yellow - Alternator A.C. Leads
Red - Alternator D.C. + Leads
Brown - Alternator D.C. - Leads
Black - Alternator Ground Leads, Battery Ground Leads
Orange - 12 Volt Starter B + Leads
Dark Green - Ignition Shut-Off Leads
NOTE: PRIOR TO AUGUST 1992, WIRE CODES CHANGED ACCORDING TO MODEL AND SPECIFICATION
NUMBERS.
ELECTRICAL TERMS
ALTERNATOR - An alternator consists of coils of wire wound around a metal lamination stack. When a magnet
is moved past the coils, a current is induced in the coils. In general, the greater the number of coils, the greater
the output of the alternator.
RECTIFIERS and DIODES - Charging a battery requires that the alternating current produced by the alternator
be changed to direct current. This is accomplished by using a diode or rectifier.
REGULATOR/RECTIFIERS - This combines a regulator with a rectifier. The regulator prevents overcharging
of the battery and the rectifier changes the alternating current to direct current.
CONDUCTORS - A conductor is a material that allows an electric current to pass through it. All metals are
conductors of electricity, but some are better conductors than others. Silver, copper and gold are some of the
better known conductors.
INSULATORS - An insulator is a material that will not allow an electric current to pass through it. Some of the
more common materials that are insulators are glass, plastic, rubber, ceramics and porcelain.
BASIC CHECKS
Before going into extensive checks, be sure to perform the more basic checks first, such as:
1. Battery defective or not charged.
2. Corroded or loose terminals or connections, or wrong connections.
3. Cracked insulation or broken wires.
4. A wire "grounding out" in the system.
5. Defective switch.
6. Operator presence system functioning properly.*
*NOTE: ALL LAWN AND GARDEN TRACTORS BUILT AFTER JULY OF 1987 ARE REQUIRED TO HAVE AN
OPERATOR PRESENCE SYSTEM AND MANY CAME EQUIPPED WITH SUCH A SYSTEM PRIOR TO THIS
DATE. IF THE TRACTOR IS "CUTTING OUT" OR WILL NOT START, THIS IS AN AREA THAT SHOULD BE
CHECKED OUT.
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