TM 9-2320-361-20 Section Ill. PRINCIPLES OF OPERATION 1-16. GENERAL This section explains how components of the 2-1/2-ton, M44A2 series vehicles work together. A functional description of these components and their related parts will be covered in the following paragraphs. Electrical wiring schematics shown are for reference only and are not to be used for troubleshooting. To find the operation of a specific system or component, see the principles of operation reference index below. 1-17. PRINCIPLES OF OPERATION REFERENCE INDEX PARA. TITLE PAGE NO. NO. 1-18. Control Systems Operation 1-38 1-19. Power Systems Operation 1-46 1-20. Electrical Systems Operation 1-56 1-21. Compressed Air and Brake System Operation 1-60 1-22. Special Purpose Bodies Systems Operation 1-64 1-37