F 150 4WD V8-5.4L Flex Fuel (2008)
AC4-AC6
Tests AD: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
PINPOINT TEST AD: THE TRAILER BATTERY CHARGING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
Normal Operation
The trailer battery charging is accomplished through the use of the trailer tow battery charge relay. The trailer tow battery charge relay is supplied
voltage and ground through the central junction box (CJB). The trailer tow battery charge relay is energized when the ignitions switch is in the RUN
position. When energized, the trailer tow battery charge relay routes voltage from the CJB fuse 106 (30A) to the trailer tow connector through circuit
49 (OG).
This pinpoint test is intended to diagnose the following:
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Fuse
-
Wiring, terminals or connectors
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Trailer tow connector
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Trailer tow battery charge relay
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CJB
-
Trailer
