Taylor-Dunn ET-015-00, Operation, T Roubleshooting And Replacement Parts Manual

Page: 111 / 166

Maintenance, Service, and Repair
Electrical Troubleshooting
Page 11
SYMPTOMS GO TO
Ø
Runs slow in both directions plus high armature current in both directions.
NOTE: Field current will be very low.
CONTACTORS, P 13
Ø
Runs normal in one direction only plus runs slow or lacks power in the opposite
direction with high armature current in the opposite direction or;
Accelerates slowly and exceeds normal speed in the opposite direction with high
armature current only.
NOTE: Field current will be very low in the opposite direction.
CONTACTORS, P 13
Ø
Accelerates slowly and exceeds normal speed in both directions plus high
armature current.
NOTE: Field current will be very low.
CONTACTORS, P 13
Ø
Does not run in either direction plus there is noise from motor (hum or whine)
with high field current and low armature current.
PLUGGING DIODE,
P 12
Ø
Excessive spark when connecting battery
ISO, P 13
Ø
Does not run or runs very slow with low motor current and high battery current.
FREEWHEEL DIODE,
P 12
UNUSUAL SYMPTOM TROUBLESHOOTING GUIDE
This section is specific to the symptoms listed below. Each troubleshooting sequence assumes that
all listed symptoms are present. Do not use this section unless the vehicle is exhibiting has all listed
symptoms.