Model 6210 Maintenance Manual
Section 5. Troubleshooting Electrical Troubleshooting Guidelines
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 key switch ON. If the battery was previously removed, make sure the battery case does not touch the truck frame.
• 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.
NOTE: 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 to truck B+, to truck 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
Publication: 1146947, Revised: 12 Jan 2017
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