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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 818 (Exterior Lighting System (F250-F550)) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test AB: The Trailer Lamps Are On Continuously >> Normal Operation - Trailer Tow Parking

Normal Operation - Trailer Tow Parking

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The trailer tow parking lamp relay is integral to the central junction box (CJB). The trailer tow parking lamp relay coil receives voltage through circuit 14 (BN) when the vehicle parking lamps are illuminated. The trailer tow parking lamp relay coil is grounded through circuit 570 (BK/WH). The CJB fuse 38 (20A) supplies voltage to the trailer tow parking lamp relay. When the trailer tow parking lamp relay is energized, the voltage is routed to the trailer tow connector through circuit 962 (BN/WH).

Possible Causes

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