Page F-5
Repair and Service Manual
B
B
ELECTRONIC SPEED CONTROL
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Fig. 5 Battery Reference Voltage
Continuity Check
To prevent possible injury or death resulting
from a battery explosion, use an insulated
wrench and remove the BL- wire from the bat-
tery to disconnect electrical power to vehicle.
Before attempting to perform a continuity
check, turn the key switch to ‘OFF’ and place
the direction selector in neutral.
Before any electrical service is performed, the Run-Tow/
Maintenance switch must be placed in the ‘Tow/Mainte-
nance’ position.
If a power wire (battery, motor or controller) is discon-
nected for any reason, the Run-Tow/Maintenance
switch must be left in the ‘Tow/Maintenance’ position
for at least 30 seconds after the circuit is restored.
Turn the key switch to ‘OFF’ and place the direction
selector in neutral before disconnecting power by
removing the BL- connection to the battery.
Always use
insulated wrenches when working on batteries.
To
check for continuity, set the DVOM to the KW setting
and select ‘Continuity’. The meter will give an audible
signal when it detects continuity. If the meter does not
have a continuity setting, set it to KW, the meter will indi-
cate “0” when it detects continuity.
Testing a Switch for Continuity
Place one probe on one contact of the switch, place the
second probe on the second terminal of the switch (Ref
Fig. 6).
Fig. 6 Continuity Check of Switch
Actuating a normally open (NO) switch will cause the
DVOM to show “0” or give an audible indication when
the switch is operated. A normally closed (NC) switch
will cause the meter to show “0” or give an audible indi-
cation when the probes are attached without activating
switch. The audible indicator will stop and the meter dis-
play will indicate a value greater than “0” when the
switch is activated.
The change in display or audible indicator demonstrates
that the switch is functioning.
Testing a Solenoid for Continuity
Place one probe on one of the large terminals and the
other probe on the second large terminal (Ref Fig. 7). If
the meter shows “0” or gives an audible indication, the
solenoid terminals are “welded” closed and
the
sole-
noid must be replaced.
Negative
Probe
to B-
Positive
Probe
to B+
v
?
?
Battery
Reference
Voltage
Front of Vehicle
Press to
activate
switch
Summary of Contents for EXPRESS L6 2012
Page 6: ...Page iv Repair and Service Manual NOTES TABLE OF CONTENTS...
Page 201: ......
