Survey of Truck Electrical Cranking Systems

This paper reviews torque and speed capabilities of 12 and 24 volt cranking motors for heavy duty trucks. Advantages of 24 volt cranking are brought out, with a description of dual voltage switching or transformer/rectifier systems that are necessary.

Effect of diesel crankcase lubricating oil grade on cold cranking is emphasized. Importance of the new “Maintenance Free” batteries on cranking motor performance is shown. Improvements in 12 volt cranking motor performance are projected.