When the charging system is operating normally, the voltmeter will read between 11-16 volts when the engine is running. If the voltmeter operates abnormally, or if an undercharged or overcharged battery condition occurs, the following procedure may be used to diagnosis the charging system.

An undercharged battery is often caused by accessories being left on overnight, or by a hood or instrument panel compartment lamp that stays on.

Noise from a generator may be caused by a loose drive pulley, loose mounting bolts, worn or dirty bearings, faulty diode or faulty stator. A magnetic whining noise may be heard from vehicles equipped with the CS-130D generator. This is considered a normal condition.

To avoid damage to the electrical equipment, always observe the following precautions:

Precautions

1. Do not reverse the connections to the generator.
2. Do not short across or ground any of the terminals in the charging circuit, unless otherwise directed by instructions.
3. Never disconnect the generator BAT terminal while the generator is operating.
4. When connecting a battery charger or a booster battery, follow the procedure in Jump Starting in Case of Emergency .
5. Do not attempt to disassemble CS-130D generator. Damage to the generator could result.

Trouble in the charging system will show up as one or more of the following conditions:

1. An abnormal voltmeter reading
2. An undercharged battery condition (with slow cranking or a dark hydrometer)
3. An overcharged battery condition (with electrolyte leaks or a yellow hydrometer). Refer to Battery Replacement .

Tool Required

J 39200 Digital Multimeter

To diagnosis the CS-130D or CS-144 charging system, use the following procedure.

1. Inspect the accessory drive belt for damage or wear. Service or replace as necessary.
2. Inspect the wiring.
3. Check for an undercharged or overcharged battery condition (voltage lower than 11 volts or higher than 16 volts), refer to Battery Is Undercharged or Overcharged .

•	Detach the wiring harness connector from the generator.

•	With the ignition switch in the ON position and the engine not running, connect the J 39200 as a voltmeter from a ground to the L terminal in the wiring harness connector. Connect the F or the I terminal for the gauge equipped vehicles. At least one terminal should have battery voltage.

•	Zero volts indicates an open circuit between the terminal and the battery. Connect as required.

•	Reconnect the wiring harness connector to the generator.

Important: Disconnect the negative battery cable before removing or installing a series-type ammeter at the generator battery terminal.

•	Install an ammeter at the generator output terminal. With the load off, install a carbon pile load test across the battery terminals. Start the engine and run at 2500 RPM. Make sure this is done at ambient temperature.

•	Measure the voltage across the battery, using the J 39200 . If the voltage is above 16 volts, replace or repair the generator.

•	Turn on the accessories and place a load on the battery with the carbon pile to obtain maximum generator output. Maintain voltage at 13 volts or above. Use an ammeter to check amperage. Compare output to amperage rating in Generator Usage (LT1)Generator Usage (L36) .