F 350 2WD Super Duty V10-6.8L (2009)
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Are the voltages greater than 10 volts?
Yes
GO to K6.
No
GO to K5.
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K5 CHECK THE RESISTANCE BETWEEN THE UPFITTER RELAYS AND THE UPFITTER SWITCHES
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Ignition OFF.
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Disconnect: Upfitter Switches C2300.
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Measure the resistance between the upfitter relay, harness side and the upfitter switch C2300, harness side as follows.
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Are all the resistances less than 5 ohms?
Yes
INSTALL a new upfitter switch. REFER to Upfitter Switch See: Power and Ground Distribution/Power Distribution Module/Service and
Repair/Upfitter Switch.
No
REPAIR the suspect circuit. TEST the system for normal operation
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K6 CHECK THE UPFITTER RELAYS VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
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Measure the voltage between the upfitter relay, harness side and ground as follows:
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Are all the voltages greater than 10 volts?
Yes
GO to K7.
No
