Page F-4
Repair and Service Manual
B
ELECTRONIC SPEED CONTROL - TCT
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
GENERAL TROUBLESHOOTING
Tool List
Qty.
Floor jack ..................................................................... 1
Jack stands.................................................................. 2
Wheel chocks .............................................................. 4
Jumper wire (with alligator clips) ................................. 1
Digital Volt Ohm Meter................................................. 1
Socket, 3/8" ................................................................. 1
Socket, 10mm.............................................................. 1
Ratchet ........................................................................ 1
Torque wrench, in. lbs.................................................. 1
Torque wrench, ft. lbs. ................................................. 1
Extension, 6" ............................................................... 1
Insulated wrench, 9/16" ............................................... 1
Wrench, 1/2" ................................................................ 1
Wrench, 7/16" .............................................................. 1
Phillips screwdriver, large ............................................ 1
Phillips screwdriver, small............................................ 1
Shop towel................................................................... 1
Allen wrench, .050"...................................................... 1
Drill bit, 7/32” ............................................................... 1
Symptoms
Vehicle does not operate, operates poorly or intermit-
tently.
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 eight volts or higher in an open volt-
age test. If there is any doubt as to the adequacy of the
battery 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.
Fig. 4 Battery Reference Voltage
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. 4 on
Page F-4). 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.
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.
v
?
Battery
Reference
Voltage
Positive Probe
to BL+
Negative Probe
to BL-
