Page G-8
Repair and Service Manual
B
ELECTRICAL
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
STORAGE OF BATTERY
A battery that is removed from service for storage must
be cared for as follows:
For battery removal see 'Battery Removal' in Section B.
Charge fully. Cover terminals with petroleum jelly to
prevent oxidation (use commercially available battery
protectant when installed in vehicle). Store in a cool
place not below 32° F (0° C) or above 80° F (27° C)
Battery should be charged every 30 days using a 2 amp
trickle charger.
TROUBLESHOOTING
In order to effectively troubleshoot the circuits that
include the horn, lighting, brake/turn signals and
gauges, the technician must be able to use the wiring
diagram and a DVOM.
The wiring diagram shows the path followed by a voltage
or signal from its origination point to its destination. Each
wire is indicated by color. (Ref Fig. 8 on page G-9) The
technician should use simple logic troubleshooting in
order to reduce the number of steps required to isolate
the problem.
Example 1:
If the vehicle will not start and none of the
lights function (or burn dimly) the battery should be
tested before trying to troubleshoot the lighting circuit.
Example 2:
If a problem occurs in the lighting circuit that
results in only one of the headlights not working, there is
no reason to check battery wiring or the fuse since it is
obvious that voltage is present. Since bulbs will burn out
over time, the obvious place to start is at the headlight
that is not functioning. If power is present at the
connector and the ground wiring is satisfactory, the only
possibilities that exist are a burned out bulb or a poor
contact
between the connectors and the headlight.
If power is not present but the other headlight functions,
a wiring problem is indicated between the two
headlights.
In some cases where battery voltage is expected, the
easiest way to test the circuit is to set the DVOM to DC
volts and place the negative (-) probe of the DVOM on
the negative battery terminal. Move the positive (+)
probe to each wire termination starting at the battery and
working out to the device that is not working. Be sure to
check both sides of all switches and fuses.
When no battery voltage is found, the problem lies
between the point where no voltage is detected and the
last place that voltage was detected. In circuits where no
voltage is expected, the same procedure may be used
except that the DVOM is set to continuity. Place the
negative (-) probe on a wire terminal at the beginning of
the circuit and work towards the device that is not
working with the positive (+) probe. When continuity is
no longer indicated, a failed conductor or device is
indicated.
POWER SUPPLY
Tool List
Qty.
DVOM ......................................................................... 1
1.
Check for Loose or Bare Wires
Check for loose wires at each terminal connection and
for worn insulation or bare wires touching the
frame.BARE WIRES MAY CAUSE A SHORT CIRCUIT.
If
any DVOM readings indicate a
faulty wire, it is recommended
that the condition of the terminals and wire junction be exam-
ined. A faulty wire must be replaced. See 'FAULTY WIRE
REPLACEMENT'.
2.
Check Battery Condition
Check for adequate battery volts (nominal 12 VDC) by
setting DVOM to 30 VDC range and place the red
probe
(+)
on the battery post with the white (WHT)
wire
attached. Place the black probe (-) on the battery post
with the black (BLK) wire attached. A reading of 11
VDC or greater indicates adequate battery condition.
No reading indicates (a) a poor connection between
the probes and the battery terminals; (b) a faulty
DVOM. A voltage reading below 11 volts indicates
poor battery condition and the vehicle should be
recharged before proceeding with the test.
.
Due to the resistance of the wires involved within the harness,
voltage readings may be somewhat lower than battery voltage.
A reading of 1 volt below battery voltage is acceptable.
3.
Check Power Wire
Firmly attach the black probe (-) to the battery post
with the black wire attached and the red probe
(+)
to
the power (white) wire terminal at the fuse block. A
reading of battery voltage indicates that the power
wire is in good condition.
The power wire supplies power to the entire fuse block.
4.
Check Fuse
Place the red probe
(+)
to each wire terminal on the
fuse block. A reading of battery voltage indicates that
the fuse is in good condition. No reading indicates a
faulty fuse; replace with a good fuse of the same
amperage rating
NOTICE
NOTICE
NOTICE
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