Question about 2006 Ford F-150

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After a rear end collision, the turn signals and 4-way flashers don't work right. turn on left signal and all lights in rear flash.

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Sounds like a ground problem, and the turn signal is trying to use another path to ground, causing the other lights to glow.

Check the left side bulb socket for a good ground.

The other test is to pull the L & R Stop / Turn fuses for the trailer tow adapter, to make sure the problem is not with the 4 or 7 pin trailer adapters.

Posted on May 06, 2010

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Posted on Jan 02, 2017

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