F 150 4WD V8-4.6L VIN 8 (2010)
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Is the voltage greater than 10 volts?
Yes
INSTALL a new high mounted stoplamp. TEST the system for normal operation.
No
REPAIR circuit GD139 (BK/YE) for an open. TEST the system for normal operation.
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J4 CHECK FOR VOLTAGE TO THE LH STOPLAMP
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Disconnect: LH Rear Lamp.
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While applying the brake pedal, measure the voltage between the LH rear lamp, harness side and ground as follows:
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.