Table 2-2. Unit Troubleshooting-continued
TEST OR INSPECTION
TRAILER ELECTRICAL SYSTEM (Models WPES-10 and H-9518-1)
Flatbed cargo trailer electrical system contains 24 VDC which can cause severe burns.
Be sure to remove watches, bracelets, rings and other metal objects when working on
brake electrical system.
Testing electrical system with power connected can cause damage to flatbed cargo trailer
electrical system. Take proper measures to ensure wires do not touch trailer chassis
Before troubleshooting flatbed cargo trailer electrical system, ensure that towing
vehicles battery is fully charged.
Ensure that there are no burned out lamps on trailer,
Turn lights on at towing vehicle.
TRAILER LIGHT INOPERABLE.
Disconnect trailer cable assembly from towing vehicle and check cable connector for bent, missing or
If pins are broken or bent, replace cable assembly. Refer to Paragraph 2-81.
If pins are corroded, clean them with sandpaper and reconnect cable assembly to vehicle.
Check vehicle connector for damaged socket pins and correct voltage outputs in accordance with vehicle
If voltages are not available at vehicle connector or socket pins are damaged, refer to towing vehicle
Technical Manual for troubleshooting and corrective action procedures.
2-66 Change 1