Question about 1993 Ford F350

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1995 Ford F350 having issues with marker lights and left turn when hooked to tow a trailer. Everything works on the truck when NOT pluged into the trailer, but when connection is made the only lights that work are the right turn, brake and trailer brake lights. The truck has a factory tow hitch and ALL lights worked just fine 2 days ago.

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Check wiring on trailer

Posted on Sep 12, 2009

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Check your ground. When weird gremlins happened that is often the case. Also it is absolutely essential when diagnosing trailer light issues to have a circuit tester (inexpensive voltmeter/ohmmeter from RadioShack) to check for current or shorts along the system.

Posted on Aug 31, 2014

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If everything works when trailer is not connected it's gotta be in the truck plug or trailer
sounds like a ground was lost in the left trailer light

they do sell trailer wiring simulators (about 20 bucks) you plug em in the truck and it simulates trailer lights with little led's on it

Posted on Oct 06, 2009

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