Sevcon Troubleshooting
Page 10
Electrical Troubleshooting
Test 4. KEY FAULT
TEST 4.3:
Test the voltage at the cold side (violet/black wire)
of the key switch.
If the voltage equals battery volts, then skip
ahead to test #4.4.
If the voltage does not equal battery volts,
then replace the key switch.
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.
TEST 4.4:
Check the wire from the cold side of the key switch
to pin #1 on the 12 pin logic card connector for
open circuits.
NOTE: Your vehicle may be equipped with a charger
interlock relay. The charger interlock relay
disables the control system when the
charger is connected to its power source.
The interlock relay contacts are in series with
the wire from the cold side of the key switch
to pin #1 on the 12 pin logic card connector.
The relay is located in the charger cabinet.
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.
Typical Circuit Breaker
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.
Stop, do not continue. Reaching this point
indicates a failure in the Sevcon power unit
or an error was made during testing. Confirm
all previous tests were performed correctly
before replacing the Sevcon power unit.
STOP
TEST 4.1:
Turn the key switch ON and place the forward and
reverse switch in the center OFF position
Perform the following tests:
Test the voltage at pin #1 on the 12 pin logic card
connector.
If the voltage equals battery volts, then skip
ahead to Test #5.
Test the voltage on both terminals of the battery
voltage positive circuit breaker (see below).
If the voltage on both terminals equals
battery volts, then skip ahead to test #4.2.
If the voltage on both terminals does not
equal battery volts, then check the circuit
breaker and wiring to the main circuit breaker
and to the batteries for open circuits.
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.
TEST 4.2:
Test the voltage at the hot terminal (red wire) on
the key switch.
If the voltage equals battery volts, then skip
ahead to test #4.3.
If the voltage does not equal battery volts,
then check the wiring from the key switch to
the battery voltage positive circuit breaker.
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.
Summary of Contents for B0-T48-48 Taylor Truck T48
Page 2: ......
Page 12: ...Model B 1 00...
Page 58: ...Maintenance Service and Repair Steering Page 14 Exploded View of Steering Gear...
Page 76: ...TAYLOR DUNN...
Page 94: ...TAYLOR DUNN...
Page 102: ...TAYLOR DUNN...
Page 116: ...TAYLOR DUNN...
Page 119: ...Sevcon Troubleshooting Page 3 Electrical Troubleshooting Identifying Your Controller...
Page 138: ...Sevcon Troubleshooting Page 22 Electrical Troubleshooting...
Page 158: ...Battery Charger Page 20 MN 402 000...
Page 161: ...Wire Diagrams Wire Diagrams Page 3...
Page 166: ...Illustrated Parts Parts Page 4 Front Brakes...
Page 168: ...Illustrated Parts Parts Page 6 Steering Linkage...
Page 170: ...Illustrated Parts Parts Page 8 Steering Column 1 2 3 4 5 6 7 9 8 12 10 11 13 14...
Page 172: ...Illustrated Parts Parts Page 10 Steering Gear 9 15 16 10 2 3 14 17 12 11 13 6 8 7 5 1 4...
Page 174: ...Illustrated Parts Parts Page 12 Front Suspension...
Page 176: ...Illustrated Parts Parts Page 14 Transmission Gear Case...
Page 178: ...Illustrated Parts Parts Page 16 Transmission Differential Case...
Page 182: ...Illustrated Parts Parts Page 20 Rear Brakes Brake Body...
Page 186: ...Illustrated Parts Parts Page 24 Motor...
Page 190: ...Illustrated Parts Parts Page 28 Master Cylinder 2 3 4 1 5 6 7 8...
Page 192: ...Illustrated Parts Parts Page 30 Brake Lines...
Page 194: ...Illustrated Parts Parts Page 32 Brake Linkage parking brake...
Page 196: ...Illustrated Parts Parts Page 34 Wheels and Tires Ref wheel hub 1 2 3...
Page 200: ...Illustrated Parts Parts Page 38 Speed Control Panel...
Page 202: ...Illustrated Parts Parts Page 40 Miscellaneous Frame and Body...
Page 210: ...Illustrated Parts Parts Page 48 Decals 1 2 4 3 5 6 7...
Page 212: ...Illustrated Parts Parts Page 50 Strobe Light...
Page 214: ...Illustrated Parts Parts Page 52 Steel Cab T48 Page 1...
Page 216: ...Illustrated Parts Parts Page 54 Steel Cab T48 Page 2...
Page 218: ...Illustrated Parts Parts Page 56 Tops T48...
Page 220: ...Illustrated Parts Parts Page 58 Doors T48...
Page 222: ...Illustrated Parts Parts Page 60 Optional Deckboards T48...
Page 224: ...Illustrated Parts Parts Page 62 Cargo Box...
Page 226: ...Illustrated Parts Parts Page 64 Stake Sides...
Page 230: ...Illustrated Parts Parts Page 68 3 4 5 6 1 2 Door Latch 9 8 7 Cab Components ET 3000...
Page 234: ...TAYLOR DUNN...