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Sevcon Troubleshooting
Page 17
Electrical Troubleshooting
Connect a volt meter across the Violet/Black wire at the electric brake harness plug and Pin #9 at the logic
card connector. The voltage should start at approximately 24 volts, then drop to approximately 15 volts
after about 0.5 seconds.
If the test is good then:
• The blue wire from the electric brake harness plug to pin #9 on the logic card connector is
broken. Stop trouble shooting here and repair the problem. When the repair is completed,
completely retest the vehicle before lowering the drive wheels to the ground.
If the test is bad then:
• The logic card is not releasing the brake. This could be a result of:
-Improper operation of the vehicle.
- fault in the vehicles wiring or switches.
-A fault in the speed controller.
-Incorrect programming.
-A failed speed controller.
Disconnect the electric brake harness connector and connect the electric brake to a 24-volt source. This
should release the brake and allow you to troubleshoot the vehicles control system. Return to the beginning
of the troubleshooting section and continue.
If the brake does not release then:
•
The electric brake has failed. Remove the brake and repair or replace the brake as required.
Stop trouble shooting here and repair the problem. When the repair is completed, completely
retest the vehicle before lowering the drive wheels to the ground.
After any repairs are made, completely retest
the vehicle before lowering the drive wheels to
the ground. Failure to retest the vehicle could
result in unexpected movement of the vehicle
resulting in injury or property damage.
This troubleshooting guide is written in
sequential order. All tests must be performed in
the order that they are written. Starting in the
middle or skipping sections when not instructed
to do so may lead to invalid test results.
Summary of Contents for B0-254-48
Page 2: ......
Page 18: ...TAYLOR DUNN...
Page 74: ...Maintenance Service and Repair Steering Page 22 Exploded View of Steering Gear...
Page 100: ...TAYLOR DUNN...
Page 136: ...TAYLOR DUNN...
Page 142: ...TAYLOR DUNN...
Page 154: ...TAYLOR DUNN...
Page 157: ...Sevcon Troubleshooting Page 3 Electrical Troubleshooting Identifying Your Controller...
Page 176: ...TAYLOR DUNN...
Page 194: ...Illustrated Parts Parts Page 2 Steering Knuckle...
Page 196: ...Illustrated Parts Parts Page 4 Front Brakes Brake body 9 above...
Page 198: ...Illustrated Parts Parts Page 6 Steering Linkage...
Page 206: ...Illustrated Parts Parts Page 14 Transmission Gear Case...
Page 210: ...Illustrated Parts Parts Page 18 Rear Brakes Brake body 8 above...
Page 212: ...Illustrated Parts Parts Page 20 Master Cylinder Brake linkage Linkage at the brake caliper...
Page 214: ...Illustrated Parts Parts Page 22 Brake Lines...
Page 216: ...Illustrated Parts Parts Page 24 Rear Suspension View from rear...
Page 218: ...Illustrated Parts Parts Page 26 Motor Rear Motor Mount...
Page 220: ...Illustrated Parts Parts Page 28 Instrument Panel dash...
Page 232: ...TAYLOR DUNN...
Page 233: ...APPENDIX A Special Tools...
Page 242: ...Model B 1 00...
Page 243: ......