Electrical System; Alternator - Test; Battery - Test - Perkins 1103D XK Systems Operation Testing And Adjusting

44
Testing and Adjusting Section

Electrical System

Alternator - Test

Illustration 37
Typical wiring schematic for an alternator
(A) Terminal "B+"
(B) Terminal "D+"
(C) Terminal "W"
(D) Ground
(1) Electrical switch
(2) Dash light
(3) Ignition switch
(4) Battery
Warning Lamp Does Not Illuminate
The warning lamp for the charging system should
illuminate when the ignition switch is in the ON
position. Follow the steps below in order to test your
system.
1. Check the light bulb. Replace the light bulb if the
element is broken.
2. Use a suitable digital multimeter to check the
battery voltage. Check the battery voltage with the
ignition switch OFF.
3. Check the voltage between the terminal (A) and
ground. The measured voltage should equal the
battery voltage.
This document has been printed from SPI². Not for Resale
4. Turn the ignition switch to the ON position. Check
the voltage between terminal (B) and ground. If
the voltage is more than 2 Volts the alternator
needs to be replaced.
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Warning Light is On When the
Engine is Running
1. Start the engine and run the engine at fast idle.
2. Use a suitable digital multimeter to measure the
battery voltage.
3. Measure the voltage between terminal (A) and
ground.
4. Measure the voltage between terminal (B) and
ground.
5. The measured voltage for terminal (A) and
terminal (B) should be 13 to 15 volts for a 12 volt
system. The measured voltage for terminal (A)
and terminal (B) should be 26 to 30 volts for a 24
volt system.
6. If the voltages do not match replace the alternator.
7. Increase the engine to full throttle. Turn an
electrical load ON.
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8. Measure the voltage between terminal (A) and
ground.
9. Measure the voltage between terminal (B) and
ground.
10. The measured voltage for terminal (A) and
terminal (B) should be 13 to 15 volts for a 12 volt
system. The measured voltage for terminal (A)
and terminal (B) should be 26 to 30 volts for a 24
volt system.
11. Replace the alternator if the voltage does not
match.

Battery - Test

Most of the tests of the electrical system can be done
on the engine. The wiring insulation must be in good
condition. The wire and cable connections must be
clean, and both components must be tight.
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