Toro 3000D manual Alternator GM 3000-D, Test Equipment, Testing for DC Current Output Fig

Alternator (GM 3000–D)

The alternator is belt driven with a internal regulator. It is located on the bottom right end of the engine. If either the alternator or the regulator is damaged, the entire unit must be replaced (Fig. 28).

Note: Prior to testing the charging system, make sure the poly V–belt to the alternator is in good operation condition and adjusted properly (see Belt Adjustment in Chapter 4 – Peugeot Diesel Engine).

Test Equipment

Use a shunt capable of handling at least 70 ampere. Also, a digital multimeter with a high impedance millivolt scale (with at least 300mv range) can be used in con­ junction with the shunt (Fig. 29).

Testing for DC Current Output (Fig. 30)

Note: Follow the manufacturer’s instructions when using a DC shunt.

1. Make sure engine is off.

IMPORTANT: To perform this test properly, the bat- tery must “not” be fully charged. See Battery Test in the Electrical Quick Checks section.

2.Install the DC shunt on the negative terminal of the battery. Make sure all connections are clean and tight for reliable amperage readings.

3.Attach RED meter test lead to the POSITIVE post of the shunt.

4.Attach BLACK meter test lead to the NEGATIVE post of the shunt.

5.Place multimeter to the millivolts scale.

6.Start the engine and run at 2000 rpm. Determine current output. Current output should be from 1 to 45 ampere depending upon battery voltage and/or current draw on the system.

7.Place multimeter to the volts scale, and verify that battery voltage is 13.5 VDC while the alternatoer is charging.

Figure 28

SHUNT

HIGH IMPEDENCE

MULTIMETER

Figure 29

NEGATIVEBLACK

BATTERYLEAD

CABLE

RED

LEAD

Figure 30

Electrical System

Groundsmaster 3000/3000–D Page 6 – 19 Rev. A Electrical System