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1993 F-250 Hazards Issue - Multi-function Switch?

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

1993 F-250 Hazards Issue - Multi-function Switch?

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Old

May 30, 2018 | 10:03 AM

#1

pdxbluef250

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1993 F-250 Hazards Issue - Multi-function Switch?

Hey all, having some trouble narrowing down the issue I'm having with my hazards lights.

Here's what's happening:

Turn signals all around are working.
Brake/tail lights are working.
All bulbs replaced with new LEDs.
Flasher/hazard relays replaced with electronic relays for LEDs and are working.
Hazards work in the front, DO NOT work in the back. Rears don't light up at all (but they do for turn signals). This issue was present before the LEDs were installed as well.

From my research so far, it looks like they're either grounding out somewhere (unlikely because the signals work), or I need to replace the multi-function switch.

Does anyone have any experience with this?

Thanks!

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Old

May 30, 2018 | 09:20 PM

#2

Da_Lariat_Chariot

Laughing Gas

Joined: Feb 2015

Posts: 765

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LEDs are a known issue on these trucks, specifically the rear brake/tail lights. They need an inline resistor to work correctly, otherwise weird problems occur.

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Old

May 30, 2018 | 09:35 PM

#3

pdxbluef250

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LEDs aren’t the problem. Turn signals and brake lights work, front hazards flash, rears don’t. I had the problem before I switched over to LEDs.

I have electronic relays to mitigate needing inline resistors.

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Old

May 31, 2018 | 06:57 AM

#4

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,667

Likes: 301

From: Easton,Ks

Yes it does sound like a bad multi-function switch.
You could try cleaning it.

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Old

Jun 4, 2018 | 01:58 AM

#5

MFJ

Senior User

Joined: Sep 2008

Posts: 287

Likes: 1

From: SE WI

Clean the multi-function switch, maybe wiggle it around a bit. I had a Sable that the hazards didn't want to work at all, as they hadn't been used very much. Repeated use got them to work.

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