F 250 2WD Super Duty V8-5.4L (2008)
AB1-AB2
Tests AC: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
PINPOINT TEST AC: THE TRAILER BATTERY CHARGING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
Normal Operation
The trailer battery charge relay coil receives voltage from the smart junction box (SJB) fuse 33 (10A) through circuit CBP33 (WH/BN) when the
ignition switch is in the RUN position. Ground for the trailer battery charge relay coil is supplied through circuit GD122 (BK). The battery junction
box (BJB) fuse 44 (30A) supplies voltage to the trailer battery charge relay switch side. When the trailer battery charge relay is energized, the voltage
is routed to the trailer tow connector through circuit CAT14 (OG).
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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Trailer tow connector
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Trailer battery charge relay
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Trailer
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SJB