Charging System - Diagnosis: Overview
Group: ENGINE ELECTRICALNumber: 99-36-009
Date: JULY, 1999
Model: ALL
Subject
CHARGING SYSTEM DIAGNOSIS
TSB OUTLINE:
DIAGNOSTIC FLOW CHART
I. GENERAL INFORMATION
(1) INITIAL CHECKS:
A) Check Battery Condition
i) Visual Inspection
ii) Load Test
iii) Three Minute Charge Test
B) Check Generator Belt
C) Check Fuses & Wiring/Connector Condition
D) Static Current Draw Check
E) Pre-Excitation Resistor (or relay)
II. CHARGING SYSTEM TESTS
(1) CIRCUIT RESISTANCE TEST:
A) Using DVOM
B) Using VAT-40 (or equivalent)
i) Circuit Resistance Test
ii) Insulated Circuit Resistance Test
iii) Ground Circuit Resistance Test
(2) GENERATOR CURRENT OUTPUT TEST:
A) Using DVOM and Ammeter
B) Using VAT-40 (or equivalent)
(3) VOLTAGE REGULATOR TEST:
A) Using DVOM and Ammeter
B) Using VAT-40 (or equivalent)
i) Voltage Regulator Test
ii) Diode Stator Test
DIAGNOSTIC FLOW CHART
The flow chart is provided as a suggested approach to efficiently diagnose a charging system.