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ELECTRICAL
5
8.2 GENERAL ELECTRCIAL PRECAUTIONS
1. Before Troubleshooting:
Always disconnect negative terminal of battery.
Check the fuses in fuse box.
Check the battery for damage, state of charge,
and clean and tight connections.
Check the alternator belt tension.
! CAUTION:
Do not quick-charge a battery unless the
battery ground cable has been connected, you
will damage the alternator diodes.
Do not attempt to crank the engine with the
battery ground cable connected incompletely.
2.Switch off ignition prior to making any connection
or disconnection in the system as electrical
surge caused by disconnecting ’live’ connections
can damage electronic components.
3. Ensure hands and work surfaces are clean and
free of grease, scarf, etc. as grease collects dirt
which can cause tracking or high-resistance
contacts. When handling printed circuit boards,
treat them as you handle a disc - hold by the
edges only, because some of the electronic
components are susceptible to body static.
4. Secure the wiring harness by using clamps so
that there is no slack. However, for any harness
which passes to the engine or other vibrating
parts of the vehicle, allow some slack within a
range that does not allow the engine vibrations
to cause the harness to come into contact with
any of the surrounding parts, and then secure
the harness by using a clamp.
5
.
Don’t damage the insulation when connecting a
wire. Do not use wires or harnesses with a
broken insulation. Repair by wrapping with
protective tape or replace with new ones if
necessary.
7. If any section of a wiring harness interferes with
the edge of a part or a corner, replace the part of
harness or wrap the section of the harness with
core tube.
8. To prevent damage to the electrical/ electronic
parts (
especially computers or semiconductors
)
or to prevent fire:
a. Always disconnect the battery. Ensure that
battery leads are routed correctly and are not
close to any potential chafing points. Never
reverse connect the vehicle battery and always
observe the correct polarity when connecting
test equipment.
b. When disconnecting the battery terminals, be
sure for the following
Turn off the ignition switch and all other
switches.
Disconnect the negative (-) terminal wire