## Charging System

#### Alternator and Vacuum Pump Performance Test

4-30

Alternator

1. Precaution for performance test.

1. The lead wires for use between the alternator terminal B and the battery positive terminal and between the terminal E and the battery negative terminal should be used 8 mm2 or more in cross section and 2.5 meter or less in length, (Use thick wire).
2. Use the small contact resistance switches in the circuit.
3. Do not mistake connection the terminal polarity in battery.

1. Alternator speed at 13.5 V.

In the test circuit illustration above, gradually increase the generator speed with SW1 closed and SW2 open until the lamp off and measure the generator speed.

The standard working generator speed is 900 – 1,200 rpm.

1. Measurement of adjustable voltage.

In the test circuit illustration above, increase the rated speed of the generator to 5,000 rpm and measure the voltage.

Adjustable voltage: 14.1 V – 14.7 V.

1. Measurement of output current.

In the test circuit illustration above, set the variable resistance at maximum and increase the generator speed with SW2 close to each output speed. Adjust the variable resistance so that the voltmeter shows 13.5 V.

The current obtained current is output current value.

Measuring Device | Specification | Quantity
DC Volt meter | 0 V – 30 V | 1
DC Ampere meter | 0 A – 150 A for 100 A specification meter | 1
Variable Resistance | 0 ohm – 0.25 ohm for 1 kW | 1
Switch 1 & Switch 2 | 80 A – 100 A | Each 1
Resister | 0.25 ohm 25 W (use for discharged battery) | 1
Lamp | 12 V 3 W | 1

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