Hello Steve

Fault code 10 is
Capacitor charge
CODE ALARM DESCRIPTION
10 CAPACITOR When the key is switch ON, the inverter tries to charge the capitor through
CHARGE a power resistance, and check if the capacitor are charged within a timout.
If they do not charge, an alarm is signalled; the main contactor is not closed.
- Check the negative connection.
- Check voltage in the input of the key. Battery voltage must be present.
- Replace the logic unit. (AC 4 traction unit)
Let me no what year the truck is

regards

John.