Table 2-2. Unit Troubleshooting-continued
TEST OR INSPECTION
TRAILER ELECTRICAL SYSTEM (Model WPES-10 and H-9518-1) - continued.
Check that chassis ground wire is securely mounted to the trailer.
If ground wire is loose, tighten it.
If ground wire appears tight, remove it, clean mounting surfaces and reinstall
securely. If trouble persists continue with step 4.
Disconnect trailer power cable assembly from wiring harness assembly at in line connectors and check it
for availability of 24 VDC at each connector while operating the required controls on the vehicle. Use
chassis as ground.
Replace trailer cable assembly if it is defective. Refer to Paragraph 2-81.
Disconnect trailer wiring harness at light assembly connectors and check for availability of 24VDC at each
connector while operating the required controls on the vehicle. Use chassis as ground.
If wiring harness is not defective, replace light assembly. Refer to Paragraph 2-80
If wiring harness is defective, replace it. Refer to Paragraph 2-82,
DIM OR FLICKERING LIGHTS.
Disconnect trailer cable assembly from towing vehicle and check for bent, broken or corroded pins.
If pins are defective, repair or replace cable assembly. Refer to Paragraph 2-81.
Step 2. Check for loose or corroded chassis ground wire.
If wire is loose tighten it.
If wire is not loose, remove it from trailer, clean mounting surfaces and reconnect securely
2-68 Change 1