Turn signals not working properly

RUNNINGMAN1999

MEMBER
2003 FORD F-450
4.6L
V8
2WD
AUTOMATIC
165,000 MILES

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

Wednesday, January 10th, 2018 AT 7:45 AM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

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 make bigger)