B
84
Repair and Service Manual
ELECTRICAL SYSTEM
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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Some voltage loss due to the resistance of the wires and
connectors can be shown by readings that could be up to
one volt less than battery reference voltage (BRV).
No reading indicates an “open” condition and the battery
wires should be checked for a broken or disconnected
wire or component.
Continuity Check
To prevent a possible injury or death
caused by a battery explosion,
disconnect the electrical power. Use
an insulated wrench to remove the negative (-) wire
from the battery.
Before removing the negative (-) wire at the battery, set
the keyswitch to the OFF position, then remove the key
from the switch. Always use insulated wrenches when
working on batteries.
To check for continuity, set the DVOM to the K
ȍ
setting
and select ‘Continuity’. The meter will give an audible sig-
nal when it detects continuity. If the meter does not have a
continuity setting, set it to K
ȍ
, the meter will indicate “0”
when it detects continuity.
Testing A Switch for Continuity
Put one probe on one contact of the switch. Put the sec-
ond probe on the second terminal of the switch (Ref Fig.
16).
Actuating a normally open (NO) switch causes the DVOM
to show “0”, or gives an audible indication when the
switch is operated. A normally closed (NC) switch causes
the meter to show “0”, or gives an audible indication when
the probes are attached, without activating switch. The
audible indicator will stop and the meter display will show
a value greater than “0” when the switch is activated.
The change in display or audible indicator shows that the
switch is functioning.
Fig. 16 Continuity Check of Switch
Testing A Solenoid for Continuity
Put one probe on one of the large terminals and the other
probe on the second large terminal (Ref Fig. 17).
If the meter shows “0” or gives an audible indication, the
solenoid terminals are “welded” closed and the solenoid
must be replaced.
If the continuity test shows that contacts are not “welded”
and the wiring to the solenoid coil is good, the coil has
failed and the solenoid must be replaced.
Fig. 17 Continuity Check of Solenoid
Press to
Activate
Switch
BEEP
BEEP
BEEP
BEEP
PRELIMINARY
