F 550 4WD Super Duty V10-6.8L (2009)
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Is the voltage greater than 10 volts?
Yes
REMOVE the jumper wire. REPAIR circuit GD115 (BK/GY) for an open. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit CLS30 (VT/WH) for an open. TEST the system for normal operation.
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P5 CHECK FOR VOLTAGE TO THE BJB FUSE 64 (5A)
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Measure the voltage between the Battery Junction Box (BJB) fuse 64 (5A), circuit CLS30 (VT/WH), input side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to P6.
No
REPAIR circuit CLS30 (VT/WH) for an open. TEST the system for normal operation.
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P6 CHECK THE PARKING LAMP SUPPLY VOLTAGE CIRCUIT FOR AN OPEN (TRAILER TOW MIRRORS)
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Disconnect: LH Trailer Tow Exterior Mirror C521.
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Measure the voltage between the LH trailer tow exterior mirror C521-5, circuit CBB64 (VT/GN), harness side and ground.
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Is the voltage greater than 10 volts?