Page F-20
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notices, Cautions, Dangers and Warnings.
B
ELECTRONIC SPEED CONTROL - HAULER 1000
To assure accurate readings, be sure to set the meter to
the closest voltage reading above the expected voltage.
To prevent injury resulting from unexpected
movement of the vehicle, always raise the rear
wheels before conducting any tests.
To prevent possible motor damage, never operate
vehicle at full throttle for more than 4-5 seconds while
vehicle is in a “no-load” condition.
For static tests, raise the rear wheels of the vehicle and
support the vehicle on jack stands (Refer to the Lifting
Procedure in Section ‘B’ Safety). Test the vehicle stabil-
ity before proceeding.
Place the direction selector in ‘F’ and turn the key switch
to ‘ON’. Depress the accelerator pedal until the micro
switch in the pedal box activates which should cause the
solenoid mounted to the controller to make an audible
click. If the solenoid does not click, test the batteries.
Testing Battery Voltage
It is important to determine the condition of the battery
set before proceeding with any electrical troubleshoot-
ing. An open voltage test is of little use since a battery
that has deteriorated to the point of requiring replace-
ment can still show six volts or higher in an open voltage
test. If there is any doubt as to the adequacy of the bat-
tery set, charge the batteries and perform a load test
using a discharge machine following manufacturer’s
instructions. If batteries are satisfactory, recharge bat-
tery set.
With the adequacy of the batteries confirmed, use a
DVOM connected directly to the battery terminal posts to
determine the open voltage of the set (Ref. Fig. 17 on
Page F-20). In the following tests, this voltage level will
be used as a reference. Some loss due to resistance of
wires and connectors may be indicated by readings that
could be up to one volt less than the reference voltage.
No reading indicates an “open” condition and the battery
wires should be inspected for a broken or disconnected
wire or component.
.
Fig. 17 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 on 48 volt mod-
el vehicles, the Run-Tow/Maintenance switch must be
placed in the ‘Tow/Maintenance’ position.
If a power wire (battery, motor or controller) is discon-
nected for any reason on the 48 volt model vehicle, the
Run-Tow/Maintenance switch must be left in the ‘Tow/
Maintenance’ position for at least 30 seconds after the
circuit is restored.
Negative
Probe
to B-
Positive
Probe
to B+
v
?
?
Battery
Reference
Voltage
Front of Vehicle
