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Publication Date: July 30, 2007

2008 F-Super Duty


The 2008 F-Super Duty vehicle is equipped with a smart junction box (SJB) or generic electronic module (GEM) and its function is to provide protection against excessive current loads, typical of a short circuit, by shutting down circuit operation. The SJB/GEM strategy may interpret the switching between Ford headlamps and emergency vehicle lighting, and vice-versa, as a short-to-ground, causing the power feeding a headlamp circuit through the SJB to be turned off.


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