F 550 2WD Super Duty V10-6.8L (2009)
P8 CHECK FOR VOLTAGE TO THE INOPERATIVE PARKING LAMP USING THE CONNECTOR GROUND
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Measure the voltage between the inoperative lamp, harness side as follows:
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Is the voltage greater than 10 volts?
Yes
INSTALL a new bulb holder, cab marker lamp, rear lamp assembly or trailer tow exterior mirror in question. REFER to Cab Marker Lamp See: Marker
Lamp/Service and Repair/Cab Marker Lamp or Mirrors as necessary. TEST the system for normal operation.
No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.
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P9 CHECK FOR CORRECT SJB OPERATION