Single lamp failure: Problem appears to be isolated to one lamp. Check the condition of the 7-way connector. If there is no power there, check the 7-way socket on the tractor.ģ. If there is no power there, check the back of the 7-way cable from the tractor. Check to see if you have power at the 7-way of the trailer. Possible causes: Burnt out light bulb causing a break in the system corrosion in harness, light plug or pigtail ground problem hydraulic lock from too much dielectric grease bad spot in wiring harness issues in the 7-way plug issues from the tractor.ġ. Total lighting failure: No part of the system appears to be powered. Below are some basic guidelines on how to troubleshoot some of the problems that may arise with a trailer lighting system. One of the most common reasons for an officer to pull a driver over is for a faulty light.
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