Blinker does not flash
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7th Gear
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Blinker does not flash
Hello all, Ive been trying to fix the blinker on my ‘92 f250, and cant seen to diagnose my problem. For starters, all bulbs are new LEDs, which have been tested with and without 50ohm resistors (no difference). I have tried three seperate relays in the fuse panel with no luck. Even bought some basic 3157 lamps similar to the ones that come stock, and they dont flash. It cant be a problem with my fuse box, as the under dash harness has recently been replaced. If anyone has some insight or has had the same problem a push in the right direction would be great.
Lead Driver
Joined: Jun 2021
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Hello all, Ive been trying to fix the blinker on my ‘92 f250, and cant seen to diagnose my problem. For starters, all bulbs are new LEDs, which have been tested with and without 50ohm resistors (no difference). I have tried three seperate relays in the fuse panel with no luck. Even bought some basic 3157 lamps similar to the ones that come stock, and they dont flash. It cant be a problem with my fuse box, as the under dash harness has recently been replaced. If anyone has some insight or has had the same problem a push in the right direction would be great.
If it worked before that.
You need to double back your work.
No offense. But you said the likely cause and first thing to work on
What about hazzards? Did you replace the hazzard flasher??
Whats the status of your rear bulbs, and your CHMSL on the cab?
Do you have a working light switch , aka, do your headlights work right?
Do you have functional flash to pass and high beams?
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7th Gear
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Hazzards work, just put the hazzard flasher in today, as well as tried two other relays including the one that came with the truck. All rear bulbs are LED and brand new, I even bought a set of original style bulbs from auto zone just to see if the LEDs were the problem. CHMSL has stopped working since the time it was parked, but headlights and high beans both function as intended. Another thought I had was the ground may be caked in dirt, but not sure if that could be the problem.
Lead Driver
Joined: Jun 2021
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Hazzards work, just put the hazzard flasher in today, as well as tried two other relays including the one that came with the truck. All rear bulbs are LED and brand new, I even bought a set of original style bulbs from auto zone just to see if the LEDs were the problem. CHMSL has stopped working since the time it was parked, but headlights and high beans both function as intended. Another thought I had was the ground may be caked in dirt, but not sure if that could be the problem.
And your issue, to me, is sounding like the headlight switch-to-column multifunction switch wiring.
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7th Gear
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It is a zf5 truck. Im not exactly sure what you mean by headlight switch-to-column mulitfunction switch but can assume its the rod that you can pull and twist to turn the headlights and interior cab light on. If this was faulty would having no blinker be my only issue?
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It is a zf5 truck. Im not exactly sure what you mean by headlight switch-to-column mulitfunction switch but can assume its the rod that you can pull and twist to turn the headlights and interior cab light on. If this was faulty would having no blinker be my only issue?
Id recommend pulling the switch for the headlight and the column switch and checking contacts/wire conditions
Also, a really good thing to check is to try probing your trailer wiring for turn signal while you have the switch in detent with key on. The trailer wiring originates from the trucks switches but it does piggyback off the wiring for the truck,its doing its own runs.
Stop/Turn should be tied to the wires, so dont hold on the brake or youll be confused whats happening lol
The trailer wiring terminates by the rear bumper regardless if you have a connector or not.
the colors for your year may differ from SAE standardized trailer wiring, i forget what year they changed it.
Does your cluster indicators work with the switch? Even if its just solid lit while in detent?
Hotshot
Joined: Jul 2020
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From: Near Salt Lake City
You might need an electronic flasher with your LED bulbs
Your LED bulbs might not be providing enough feedback resistance for the flasher to operate
**Switch the bulbs back to normal bulbs as a test and leave them in there when it fixes it
Your LED bulbs might not be providing enough feedback resistance for the flasher to operate
**Switch the bulbs back to normal bulbs as a test and leave them in there when it fixes it
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Logistics Pro
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Did you test it before installing it?
I'd start there.
And, more than likely, a loose or bad connection.
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7th Gear
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So I just replaced the blinker/hazzard switch, and am having the same issues. Someone said something about LED flahsers for the lights, and I have tried three different units with no success. I also got feedback to check trailer wiring, but I have run a custom harness which does not include trailer wiring since theres no use on this truck. Could this be the problem although the blinkers worked when it was wired? Indicators on the cluster do work, but do not blink as well. I have a new headlight switch on order, might as well try it. Also saw someone say it could be fuse box or connection wiring. This truck has a new old stock under dash harness, and all of these functions have worked in the past with this harness. I dont see any visible pinches or exposed wires, like I said this harness looks like its from 1992.
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7th Gear
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No, only custom part of my wiring is for the four bulbs in the brake lights and one for the license plate light. Everything else is an oem harness, under dash harness has been replaced. This truck never had trailer wiring, so I assume its wrapped up somewhere where the previous owner trashed the harness that I had to replace. No where in my response did I say anything about a custom engine harness, not sure where you saw that
Last edited by Aaron71houston; Feb 26, 2025 at 07:28 PM.
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No, only custom part of my wiring is for the four bulbs in the brake lights and one for the license plate light. Everything else is an oem harness, under dash harness has been replaced. This truck never had trailer wiring, so I assume its wrapped up somewhere where the previous owner trashed the harness that I had to replace. No where in my response did I say anything about a custom engine harness, not sure where you saw that
which was every function at the rear in two plugs and no relay for the 12v accessory to directly
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7th Gear
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WAS just as wired as yours. You have to realize these trucks are between about 25 and 40 years old at this point. Not every truck is gonna be in showroom condition, and some of us have truck that have been used on farms and abused. Got my problem resolved, thanks for your input.
Last edited by Aaron71houston; Feb 26, 2025 at 10:05 PM.
Lead Driver
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WAS just as wired as yours. You have to realize these trucks are between about 25 and 40 years old at this point. Not every truck is gonna be in showroom condition, and some of us have truck that have been used on farms and abused. Got my problem resolved, thanks for your input.
I dont know who the PO was but the trailer wiring does its thing without any trailer attached, and people often would hack the original tail lights for those functions, but that would not change the trailer wires.
if your trailer wires were tapped...
The test would still work. Youd have to full on short to ground multople circuits
Im not trying to fight you im just saying you were 100% certain on your flashers, but you clearly didnt have the right kind
you said you had resistors, implying it couldnt be the flasher just with low draw because you had the resistors. Then the wiring you changed under dash, fortunately wasnt it.
I want good things to come to your truck, lol
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