Blinker issues
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1st Gear
Joined: Jan 2023
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Blinker issues
2001 f350 I have had this truck for years never much issues always maintained and all service done by me. Well yesterday when turning my blinker on the hazard light came on I am stumped as to what could be next. If the blinkers are turned on the front flash as the hazard where turned on but back flash with signal direction Right turn signals = back right flashes but both front flash. What I have done are the basic normal fixes and checks New flasher installed ya that's not a fun one to get to !! Maybe something I am missing? Now I put a multifunction switch and still same issue??? Thanks
Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
Lights do weird things when they have grounding issues.
I haven't heard that particular one, but since you've already replaced the flasher and multifunction switch I'd try removing one of the front bulbs and testing it.
If the other side blinks normally reinstall the bulb and remove the other side and retest.
If one side doesn't work on either above scenarios check for ground from the bulb socket.
Welcome to the site!
I haven't heard that particular one, but since you've already replaced the flasher and multifunction switch I'd try removing one of the front bulbs and testing it.
If the other side blinks normally reinstall the bulb and remove the other side and retest.
If one side doesn't work on either above scenarios check for ground from the bulb socket.
Welcome to the site!
Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
I just looked over the schematic, the only thing I can see that might cause that is the LtGrn/white wire (left front signal) and the Wht/LtBlu wire (right front signal) wires being shorted together, or a failure inside the multifunction switch.
I'd pull the multifunction switch plug and apply power directly to the above mentioned light wires (pin 3 and 2) and see what lights up.
I'd pull the multifunction switch plug and apply power directly to the above mentioned light wires (pin 3 and 2) and see what lights up.
Lead Driver
Joined: Jul 2017
Posts: 6,860
Likes: 2,335
From: WV
I had really strange blinking conditions when installing LEDs in the ole 66. Ended up having to install resistors to ground. What it was doing made no sense logically to me. Based on the schematic it shouldn’t of had power to blink when it was.
You might try changing bulbs first. May be some issue with them or the sockets. Just pulling and replacing could fix a potential connection issue. It’s cheap to try anyhow.
edit: I also meant to second checking the grounds. Since kwik posted about it I’ll make it a 3rd.
You might try changing bulbs first. May be some issue with them or the sockets. Just pulling and replacing could fix a potential connection issue. It’s cheap to try anyhow.
edit: I also meant to second checking the grounds. Since kwik posted about it I’ll make it a 3rd.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Lights do weird things when they have grounding issues.
I haven't heard that particular one, but since you've already replaced the flasher and multifunction switch I'd try removing one of the front bulbs and testing it.
If the other side blinks normally reinstall the bulb and remove the other side and retest.
If one side doesn't work on either above scenarios check for ground from the bulb socket.
Welcome to the site!
I haven't heard that particular one, but since you've already replaced the flasher and multifunction switch I'd try removing one of the front bulbs and testing it.
If the other side blinks normally reinstall the bulb and remove the other side and retest.
If one side doesn't work on either above scenarios check for ground from the bulb socket.
Welcome to the site!
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
My money is on low blinker fluid. 
But bad grounds can cause some weird things in a 12v system. Had a 92 Chevy once that only 1 rear brake light would work unless you hooked up an extra body ground. The factory 1 was still there and clean, but no bueno unless a second was tied in. Never did figure that one out.
But bad grounds can cause some weird things in a 12v system. Had a 92 Chevy once that only 1 rear brake light would work unless you hooked up an extra body ground. The factory 1 was still there and clean, but no bueno unless a second was tied in. Never did figure that one out.
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