Jeep Thing / HIDDEN CONNECTION PLUG. 

JEEP JKU and Others, If you are chasing a Ghost Electrical Issue that Does not Show a Scan Code to Locate You may have Corroded Cannon Plug Connections. Service All Connections and Ground Points, Recommend Electronic Cleaner then Di Electric Grease. FYI if you do not have Dielectric Grease use Vaseline it will give same results and not interfere with connection signals.

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