US Patent 9457792 Retrofitting a vehicle drive train

A vehicle includes a drive train having a manual transmission. An internal combustion engine is coupled to the manual transmission via a clutch. The vehicle is retrofitted so that auxiliary devices operate auxiliary systems of the vehicle, a battery energizes electric drivers for the auxiliary devices, a power exchange unit is coupled to the manual transmission via a power takeoff port, an electric generator is coupled to the power exchange unit, and the internal combustion engine drives the electric generator via the power exchange unit. The battery is energized by the electric generator via a battery charger.