Komatsu PC88MR-10 Shop Manual page 518

40 Troubleshooting
Related information on troubleshooting
c12. Check of wiring harness for open or short
circuit
Check the connection (crimped part) between
connector pins and wiring harness.
If the line is open as shown as (A), repair or
replace the wiring harness or cables.
Visually check wiring harnesses for peeling of
harness covers and the pins for contact with
adjacent pins due to defective crimping.
c13. Check of fuse for breakage and corrosion
a When replacing a fuse, be sure to turn off the
power (turn the starting switch to OFF position)
and turn the battery disconnect switch to OFF
position.
A fusible link is a large-capacity fuse.
If a fuse is corroded and coated with white
powder, or there is any play between the fuse
and fuse holder, replace the fuse.
Replace each fuse with the one of the same
capacity.
Remove the cover at the rear right of the operator
seat, and the fuse holder is seen.
40-30
Open the rear left cover to gain access to fusible
links (F02), (F03), (F05), and (F06).
c14. Check of alternator voltage (when engine
speed is medium or higher)
1. Remove the cover on the machinery and
inspection cover.
2. Connect the positive (+) lead of the multimeter to
alternator terminal (B) and connect the negative
(-) lead to the chassis ground.
3. Start the engine, warm it up, and measure the
voltage while running the engine at a medium or
a higher speed.
If the voltage is abnormal, repair or replace
the alternator.
c15. Check of battery relay operation sound
1. Open the rear left side cover.
2. Turn the starting switch to the ON and OFF
positions, and check whether the battery relay
operation sound is heard or not.
If the operation sound is not heard, check the
related circuits, referring to the description of
troubleshooting for E-1 described in the E
mode troubleshooting.
If the relating circuit is normal, replace the
battery relay.
PC88MR-10