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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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2004 F 350 4wd 6.0 diesel. lost turn signal lights at

Customer Question

2004 F 350 4wd 6.0 diesel. lost turn signal lights at trailer plug outlet, no power, still have running lights at trailer plug.
JA: Is the power loss consistent, or does it fluctuate?
Customer: Consistent, no turn signal current at plug.What relay/ fuse do I need to replace. have ohmed fuse #6,
JA: What is the model of your '04 Ford?
Customer: king ranch f-350, 4wd, 6.0 diesel
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes hoping to fix myself. , ohmed out fuse 115 and 116, replaced relay 305, and two more under hood, still have same issue. Is there a separate relay box somewhere else for trailer turn signals?
JA: Anything else you think the mechanic should know?
Customer: not that I can think of. Any more questions/
Submitted: 2 months ago.
Category: Ford
Expert:  Juan Crespo replied 2 months ago.

Hi there.

To clarify, there is no power at the trailer plug outlet but all the truck signals work OK?