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Hi...the cab lights or high beams won't work on my 2007 freightliner columbia semi. How do I know if it's a short or a ground wire problem? If anyone can help me I would appreciate it so much! I can't afford my truck parked and not on the road

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Headlights on freight liners are set in fiberglass bonnets so the system needs return earth wires . Check for insulation failure at the bonnet hinges where the wiring loom comes back into the truck proper. If high beams are not working then neither will low beams if it is a wiring /earth problem. Having checked that out -check high beam relay and fuse for correct operation Check all the fuses for the cabin lights. Check that the cabin light switch is on ( does the cabin light come on when the door is opened)--blown bulbs)
Use a multimeter check for voltage at the light switch in and out to check light switch. Appreciating that you have to keep the wheels rolling it may be best to take it to a truck electrician as most trucks have common faults due to the manufacture and lay out of the wiring systems.

Posted on Nov 13, 2014

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