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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1184 (Charging System - General Information) >> Diagnosis And Testing >> Charging System >> Principles of Operation >> S Circuit 4 (WH/BK) (4.0L vehicles)

S Circuit 4 (WH/BK) (4.0L vehicles)

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

The S circuit 4 (WH/BK) (external only on 4.0L vehicles, internal on 4.6L vehicles) is used to feed back a voltage signal from the generator stator to the regulator. This voltage feedback signal (typically half the battery voltage) is used by the regulator to determine when to open the grounded I circuit 904 (LG/RD) to the PCM. The PCM, in turn, provides a signal over the CAN communication link to the instrument cluster to turn off the charging system warning lamp indicating the charging system is operating properly.

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