F 250 4WD Super Duty V8-6.4L DSL Turbo (2008)
The trailer tow RH stop/turn relay coil receives voltage through circuit CLS19 (VT/OG) when the vehicle RH rear stoplamp is illuminated. When the
trailer tow RH stop/turn relay is energized, the voltage is routed to the trailer tow connector through circuit CAT09 (GN).
The battery junction box (BJB) fuse 34 (25A) supplies voltage to both trailer tow stop/turn relays. The trailer tow stop/turn relay coils are grounded
through circuit GD122 (BK).
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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BJB
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Trailer tow stop/turn relay
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Trailer
Y1
