Service Manual

Alternator Regulated Voltage
1. Disconnect battery ground (–) cable.
2. Install an ammeter between the positive (+) terminal
of the battery and terminal
”B” of the alternator.
3. Connect a voltmeter between alternator ”L”
and
ground.
4. Connect the battery ground (–) cable.
5. Note that the voltmeter shows 0 volts when the igni-
tion key switch is in the OFF position. The voltmeter will
show voltage lower than battery voltage when the igni-
tion key switch is in the ON position (engine not running).
Battery
+
_
+
_
Ammeter
Alternator
L
B
Ignition
Switch
G
Voltmeter
6. Start the engine. Keep lights and other electrical
Figure 66
loads OFF.
7. Run engine at 2500 rpm. Read voltmeter when alter-
nator
output current drops to 10 A or less. Regulated
voltage will decrease slightly as alternator temperature
increases.
Voltage regulator ambient Regulating voltage V
temperature C (
F)
–20 (
–4) 14.2 – 15.2
20 (68) 14.2 – 14.8
60 (140) 13.9 – 14.8
80 (176) 13.7 – 14.8
Liquid Cooled Gas Engine
Page 3 – 44
Workman 3000/4000 Series