Charging System: Testing and Inspection

The operating condition of charging system is indicated by the charge warning lamp.The warning lamp comes on when the starter switch is turned to ON position. The charging system operates normally it the lamp goes off when the engine starts.
If the warning lamp shows abnormality or it undercharged or overcharged battery condition is suspected, perform diagnosis by checking the charging system as follows:
1. Visually check the belt and wiring.
2. Go to step 5 for vehicles without charge indicator light.
3. Switch on, engine stopped, light should be on.If not, detach harness at generator, ground "L" terminal lead.
a. Lamp lights, replace or repair generator.
b. Lamp does not light, locate open circuit between grounding lead and ignition switch.Bulb may be open.
4. Battery undercharged or overcharged.
a. Detach wiring harness connector from generator.
b. With switch on, engine not running connect voltmeter from ground to "L" terminal in wiring harness, and to "IG" terminal.If used.Wiring harness may connect to either "L" or "IG" or both.
c. Zero reading indicates open circuit between terminal and battery.Connect as required.
d. Re-connect harness connector to generator, run engine at moderate speed, with electrical accessories turned off.
e. Measure voltage across battery.If above 16.0 V, replace or repair generator.
f. Connect ammeter at generator output terminal.Turn on accessories, load battery with carbon pile to obtain maximum amperes output.
Maintain voltage at 13.0 V or above.
5. It within 15 amperes of rated output, generator is OK.
6. If not within 15 amperes of rated output, replace or repair generator.