I checked on three different batteries, replaced the contacts of contactors (main and pump) for new motor insulation when measuring 500v: field about 2GΩ; rotor about 5MΩ that is very good. Curtis? Right here is something I do not agree. 1) I plug the batteries, starts to heat up PTC resistor, with Curtis on the main contactor out -24V, after entering the codes C28 error occurs. 2) Disconnect the A2 cable (-M) Curtis-motor drive, plug in the battery, enter the code, the truck passes the self-test, all functions operate outside the ride (cable disconnected) after connecting cable A2 to -M carriage ride begins and so on until the re-disconnection batteries.