Turn signals not working properly

2003 FORD F-450

165,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC

RUNNINGMAN1999

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I replaced the turn signal switch, relays and verified fuses are good. No turn signal. When the turn signal is activated, the rear right on the side that should flash, goes out.

Advice please

Jan 10, 2018 at 7:45 AM

STRAILER

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Hello,

This sounds like you have a bad ground somewhere. Here is a guide and the blinker wiring diagram for your F450. Also, check the indicator flasher relay.

https://www.2carpros.com/articles/how-to-check-wiring

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below).

Please run this test and get back to us.

Cheers, Ken

Images (Click to enlarge)

Jan 11, 2018 at 1:28 PM