Method and apparatus for ground fault detection in an electric work vehicle

A method of performing a ground fault test on an aggregated battery of an electric work vehicle, the aggregated battery comprising a plurality of battery packs,

• wherein the electric work vehicle comprises an isolation monitor and a circuit configured to connect the aggregated battery to the isolation monitor, wherein the circuit comprises a plurality of contactors configured to facilitate connection to the circuit and disconnection from the circuit of each of the plurality of battery packs,
• the method comprising, in an event that the isolation monitor detects existence of a ground fault, performing the following steps in order:
• (a) notifying a user of the electric work vehicle of the existence of the ground fault;
• (b) opening the plurality of contactors;
• (c) sequencing closure of the plurality of contactors to include each of the plurality of battery packs in the circuit with the isolation monitor in turn, and using the isolation monitor to determine whether the battery pack that is included in the circuit with the isolation monitor comprises a faulty battery pack, wherein the faulty battery pack comprises a ground fault;
• and
• (d) disconnecting the faulty battery pack or battery packs.