Model 8210/8250 Maintenance Manual Section 5. Troubleshooting
Electrical Troubleshooting Guidelines
Publication:1146945/001, Revised: 25 Sep 2018 5-7
c. Repair or replace the component
causing the low resistance condition.
Repeat Step 4.
d. Reconnect all other components
previously disconnected, one at a time,
measuring resistance between steps. If
a reading is less than 1000 ohms when
reconnecting a component, that
component or its wiring is faulty; repair
or replace as appropriate.
e. When, after all components are
reconnected, and you get readings
greater than 1000 ohms, continue with
the next step.
5. Reconnect the battery connector and turn
the Main ON/OFF switch ON. If the
battery was previously removed, make
sure the battery case does not touch the
truck frame.
N
OTE: The functions being checked must be
energized. Example: to check for shorts
to frame in the travel circuit, travel must
be requested.
6. Use a DMM set to the current function to
measure current leakage to the truck
frame from truck B+, B– (not battery B+
and B–), and all fuses and DC motor
terminals. Begin measuring at the highest
ampere scale and work toward the lowest.
If the current is less than 0.001A (1mA), go
to step 7. If the current is more than
0.001A (1mA), continue with the following
steps.
a. To identify the cause of the short to
frame, disconnect circuit components
until the leakage current reads less
than 0.001A (1mA). Do not reconnect
components one at a time, but leave
them disconnected until the leakage
current reads less than 0.001A (1mA).
Prevent disconnected terminals or
connectors from touching the truck
frame or other conductive surfaces.
b. The most likely areas to check are:
•Motors
•Heatsinks
• Power cables
• Power circuit components
• Control circuit components
c. Repair or replace the component(s)
causing the leakage current.
Repeat Step 6.
d. Reconnect all other components
previously disconnected, measuring
current between steps. If a reading is
more than 0.001A (1mA) when
reconnecting a component, that
component or its wiring is faulty.
Repair or replace as appropriate.
7. When, after all components are
reconnected, you get a reading less than
0.001A (1mA) there is no short to frame
condition with the truck or the battery. If
you previously removed the battery from
the truck, re-install the battery.
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