AT 121 Chapter 13b – Charging SystemsName: _________________________________ Group: _________________________Date: __________________________________ SECTION 9 Bench Alternator Component Testing and ServiceTools you will need:Tool Board4 Alternators2 RotorsDVOM1 StatorBrush Set SECTION 10 Testing the Rotor for Opens andShortsUsing the DVOM test the rotor at the two slip rings.The reading should be between 2 and 6 Ohms.Open Circuit CheckRotor 1 Reading _________________________ OhmsRotor 2 Reading _________________________ OhmsNow move one lead to the rotor frame and the other lead to oneof the slip rings. You should get infinite ohms (OL)Grounded Circuit CheckRotor 1 Reading _________________________ OhmsRotor 2 Reading _________________________ OhmsRotor 1 Good/Bad? _______________________Rotor 2 Good/Bad? _______________________ SECTION 11 Testing the Stator for Opens and ShortsStator Grounded Open Circuit CheckUsing the DVOM test the stator at the stator junction terminalsThe reading should be between .5 and 3 Ohms.Stator 1 to 2 Reading _________________________ OhmsStator 1 to 3 Reading _________________________ OhmsStator 2 to 3 Reading _________________________ OhmsNow move one lead to the stator frame and the other lead to oneof the stator junction terminals. You should get infinite ohms (OL)Stator Grounded Circuit CheckStator 1 to Frame Reading _________________________ OhmsStator 2 to Frame Reading _________________________ Ohms1Stator 3 to Frame Reading _________________________ OhmsStator Good/Bad? _______________________ When finished have the instructor sign off on your work. _____________________________________ SECTION 12 Alternator InspectionsVisually inspect the alternators for the following defects;Alternator 1 - Fan Design – Internal / External ___________________ Bearing noise - ____________________ (Ok/Not OK)Case Damage- ____________________ (Ok/Not OK) Terminal Damage- ____________________ (Ok/Not OK)Pulley Damage or Bent Shafts- ____________________ (Ok/Not OK) Binding - ____________________ (Ok/Not OK)Alternator 2 - Fan Design – Internal / External ___________________ Bearing noise - ____________________ (Ok/Not OK)Case Damage- ____________________ (Ok/Not OK) Terminal Damage- ____________________ (Ok/Not OK)Pulley Damage or Bent Shafts- ____________________ (Ok/Not OK) Binding - ____________________ (Ok/Not OK)Alternator 3 - Fan Design – Internal / External ___________________ Bearing noise - ____________________ (Ok/Not OK)Case Damage- ____________________ (Ok/Not OK) Terminal Damage- ____________________ (Ok/Not OK)Pulley Damage or Bent Shafts- ____________________ (Ok/Not OK) Binding - ____________________ (Ok/Not OK)Alternator 4 - Fan Design – Internal / External ___________________ Bearing noise - ____________________ (Ok/Not OK)Case Damage- ____________________ (Ok/Not OK) Terminal Damage- ____________________ (Ok/Not OK)Pulley Damage or Bent Shafts- ____________________ (Ok/Not OK) Binding - ____________________ (Ok/Not OK) SECTION 13 Alternator - Ford StyleClock the alternator as shown by your instructorWhy would this need to be done? __________________________________________________________Replace the regulator and brushes When finished have the instructor sign off on your work. _____________________________________NATEF TASKS - VI. ELECTRICAL/ELECTRONIC SYSTEMSD1. Perform charging system output test; determine necessary action. P-1D2. Diagnose charging system for the cause of undercharge, no-charge, and overcharge conditions. P-1D4. Remove, inspect, and install generator (alternator).