there are 4 different AL6 codes
these are the following conditions listed that trigger this code in these controllers
-Motor current levels do not exceed a preset minimum value while driving.
-High field current values measured by controller.
-Low field current values measured by controller.
-Controller detects motor current during standby mode.

Possible causes and test proceedures
* Damaged or loose electrical connections to traction
motor.
Verify electrical connections between tractionmotor
and controller.
* Traction motor armature resistance is too low.
Check traction motor armature for shorts.
* Controller is damaged.
Cycle key switch. Place steer handle in drive position
and select throttle. If the truck starts to drive
but then stops and presents code AL6, replace controller.
* Field wires are loose, damaged, or shorted.
Verify connection of field wires to motor and controller.
* Motor field winding is shorted or too low.
Check motor field for correct resistance and continuity.
It should measure approximately 0.5 ohms.
* Failure of current sensor in controller.
Replace controller.
* Failure of field current driver in controller.
Replace controller.
* Cable connection to motor field is loose or damaged.
Verify connection of field wires to motor and controller.
* Motor field winding is open or too high.
Check motor field for correct resistance and continuity.
It should measure approximately 1.5 ohms.
* Field current sensor in controller has failed.
Replace controller.
* Main contactor circuit damaged or disconnected.
Verify electrical connection between controller and
contactor.
Check contactor coil for correct resistance of 52
ohms.
* Field current drivers in controller are damaged.
Replace controller.
* Damaged controller.
Replace controller