DETROIT DIESEL 53
BATTERY-CHARGING GENERATOR (D.C. AND A.C.)
The battery-charging circuit consists of a generator (alternator), regulator, battery and the wiring. The battery-charging
generator is introduced into the electrical system to provide a source of electrical current for maintaining the storage
battery in a charged condition and to supply sufficient current to carry any other electrical load requirements up to the
rated capacity of the generator.
The alternating current self-rectifying generator (alternator), Figs. 2 and 3, is especially beneficial on an engine with
extra electrical accessories and one that has to operate for extended periods at idle speeds. Diodes, built into the slip ring
end frame, rectify the three phase A.C. voltage to provide D.C. voltage at the battery terminal of the generator, thereby
eliminating the need for an external rectifier. The alternator is also available in a variety of sizes and types. The proper
selection of a generator which will meet the needs of the battery-charging circuit on the particular engine is mandatory.
This, together with adherence to the recommended maintenance procedures, will reduce generator troubles to a
minimum. Since most generators adhere to the same basic design, the maintenance, removal and installation
procedures for all are similar.
Maintain the proper drive belt tension. Replace worn or frayed belts. Belts should be replaced as a set when there
is more than one belt on the generator drive.
Lubricate the generator bearings as outlined in the Lubrication and Preventive Maintenance Chart in Section 15.1.
Disconnect all of the leads from the generator and tag each one to ensure correct re-installation.
Loosen the generator mounting bolts and nuts and the adjusting strap bolt. Then, remove the generator drive
SEC. 7.1 Page 1