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Turn signal too fast - Flasher?

Tiny
STEALTHFIXER
  • MEMBER
  • 2013 FORD F-150
  • 3.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 69,000 MILES
The left turn signal flashes twice as fast as right. All signal lamps flash as selected, brake lights work normally, multi-function switch replaced with new Motorcraft unit of same part number. Left signal takes approximately 3 seconds to hear relay operation although flashing starts immediately. Can not locate signal flasher. I am an aircraft mechanic and understand schematics if I have them.
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Saturday, August 3rd, 2019 AT 3:38 PM

18 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

You have no idea how refreshing that it is to hear. I have included the exterior lightning wiring diagrams in the diagrams down below for you. I also have the trailer towing package wiring diagram available for you if needed. Please keep us informed as to what you are able to find out, like a bad transistor or something like that.

Thanks,
Alex
2CarPros
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Saturday, August 3rd, 2019 AT 5:18 PM
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2004 FORD F-150
  • 60,000 MILES
Hi guys. I'm having a problem with my rear signal/flashers. Both rear signal lights failed on me, however the front works fine although they flash at double speed. I was told it was probably the flasher relay, or the fuses, but checked the fuses and bought a new relay and still have the same problem. Also replaced both rear lamps. If you can, please point me in the right direction. Be gentle though, I am a rank amateur mechanic and am doing this out of budget necessity and the desire to be self sufficient. Thanks.
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Wednesday, October 14th, 2020 AT 1:55 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Test to see if power is going to bulbs with a test light first. If it is check for a bad ground on frame. If no power it can be bad turn sig switch or shorted wire. Here is the flasher
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Wednesday, October 14th, 2020 AT 1:55 PM (Merged)
Tiny
JOSELARES
  • MEMBER
  • 1 POST
  • 2003 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 107,000 MILES
Where is the electronic flasher located on a 2003 ford f150
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Wednesday, October 14th, 2020 AT 1:55 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
In relay block to the right of the steering wheel column under the dash. The block is black with a black relay and flasher installed, could be covered in tape depending on the manufacturing plant your truck was built at.
You will need a flash light when you go looking for it.
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Wednesday, October 14th, 2020 AT 1:55 PM (Merged)
Tiny
POSTFRA
  • MEMBER
  • 1 POST
  • 1998 FORD F-150
1998 Ford F150 V8 Four Wheel Drive Automatic

When I turn on my 4-way flashers only the front ones work where are the flashers located and is there two of them.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
It will either be under the dash in the fuse panel or under the hood in the power distribution box. Here is a picture of one.


https://www.2carpros.com/forum/automotive_pictures/249084_5_57.jpg

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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
CUNN8284
  • MEMBER
  • 1 POST
  • 1989 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 191,326 MILES
How do I replace the hazard warning flasher? All the repair manual states is that it is located behind the glove department on the right hand side.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Flashers are a simple plug in replacement. Once you locate it, just unplug the old one and plug the new one in. My locator says it is on the back of the fuse block under the right side of dash.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
TOMTOM11
  • MEMBER
  • 4 POSTS
I can't even locate the 4 way flasher switch on the dash much less the flasher. I have owned this rig 3 years.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hazard Warning: To The Right Of The Glovebox
Turn Signal: Behind Instrument Panel, On Fuse Panel
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
TOMTOM11
  • MEMBER
  • 4 POSTS
  • 1989 FORD F-150
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Where is the switch to engage 4 way flashers?
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I am trying to find a picture of this but it should be part of the turn signal switch. Take a look at the wiring diagram. It shows the hazards are part of the turn signal switch. If I remember correctly, it is a small switch on the end of the turn signal switch.

I will try to find a picture and attach it here.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
TOMTOM11
  • MEMBER
  • 4 POSTS
There is depression in the turn signal stick, identical to modern high beam switch, but no clicking. At the least I can investigate this further thanks, high beam switch on floor.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Look under the dash. I don't know why I forgot this but the switch should be under the dash by the brake pedal.

Take a look at the attachment and you will see the switch when you pull it out it turns the hazards on.
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
DRH
  • MEMBER
  • 2 POSTS
  • FORD F-150
I have a 1998 Ford F150 with 101000 miles on it. The turn signals, sometimes, will blink rapidly but will not light up the turn arrow. Then if I turn them off and on they will operate normal. I am in the process of changing the flasher but can't seem to locate it.
Question; does this sound like a fault flasher and if so where is the flasher located?

Thank you
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
WEAREA2J2
  • MEMBER
  • 43 POSTS
The flasher unit may be under the dash on the right side or right by the fuse block. Good luck!
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)
Tiny
DRH
  • MEMBER
  • 2 POSTS
Thank you for your response.

I looked on the driver side in the fuse box and under the dash. Nothing.

I did not look on the passenger side (right side) I will try that.

Thank you
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Wednesday, October 14th, 2020 AT 1:56 PM (Merged)

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