Komatsu 830E-AC Shop Manual page 257

Verifying a Faulty Thermal Switch
1. Remove the cover from the control box on the
drive end housing.
2. Locate the thermal switch inside the control
box.
3. Test the two wires from the thermal switch for
continuity.
a. If there is no continuity, the switch is faulty.
b. If there is continuity, there may be a problem
with either the alternator or the wiring har-
ness.
D10003 07/06 Battery Charging Alternator D10-27