Simplicity 1691766, Service & Repair Manual

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5 - 3
5 Electrical Troubleshooting
General Information - Testing
CHECKING OUT THE SYSTEM
General
Both the ignition and charging systems are internal to the
tractor engine. Follow the Troubleshooting Guide,
Section 2, or refer to your engine manual for information.
See an authorized dealer or appropriate service manual
for additional engine troubleshooting information.
The cranking and safety start systems have intercon-
nected components. The testing of these components
and troubleshooting procedures is covered in detail in
this section.
The testing procedures contained in this section are
intended to be performed as a series. Skipping a step or
leaving it uncompleted can create a dangerous situation
and produce incorrect test results.
Unless otherwise instructed, all tests must be performed
with the ground speed control lever in the neutral gate
with the parking brake engaged, the operator present
seat switch activated, and the PTO switch off.
Reattach components after each test and touch only
points mentioned in the test procedure to avoid possible
damage to testers or components.
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.
“Ohms” are units of resistance or the VOM setting used
to measure resistance.
“Continuity” is an continuous, unbroken circuit. In this
manual continuity is determined with a VOM set to mea-
sure Ohms. Zero Ohms is true continuity. However, due
to contact point corrosion and resistance within wires,
continuity may measure several Ohms.
“No Continuity” is a broken circuit. In this manual no
continuity is determined with a VOM set to measure
Ohms. No continuity will register as infinite Ohms.
“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.
Test Series
CHECKING THE POWER SUPPLY
1. Wiring
2. Battery Tests
• Check fluid level
• Clean battery and terminals
• Hydrometer (charge) test
• Heavy load test
3. Battery Cables
ISOLATE STARTING AND SAFETY SYSTEMS
CHECKING THE CRANKING SYSTEM
1. Test Circuit Breaker
2. Test Power to Ignition Switch
3. Test Ignition Switch
4 Test Power to Solenoid
5. Test Solenoid
6. Solenoid Bench Test
7. Test Power To Starter
TEST SAFETY INTERLOCK SYSTEM
1. PTO Interlock Switch
2. Seat Switch (Mechanical)
3. Seat Switch (Electrical)
4. Clutch/Brake Switch (Mechanical)
5. Clutch/Brake Switch (Electrical)
6. Neutral Safety Switch (Mechanical)
7. Neutral Safety Switch (Electrical)
8. Interlock Module
MISC. TESTS
1. Headlights
2. Power to Headlights
3. Headlight Switch
1. Hour Meter
2. Power to Hour Meter
1. Inspect and replace Dash Lights
1. PTO Clutch