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Front right turn signal blinks fast rear has no signal or brake working

Tiny
VERNALEWIS
  • MEMBER
  • 2012 FORD F-250
  • 6.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 89,756 MILES
Checked for current none only ground. Checked fuses okay checked wires for breakage couldn't fine any. I am confused.
Wednesday, January 16th, 2019 AT 4:27 PM

13 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hi Verna, my name is Alex and I will be helping you today. Sounds to me like you might have a faulty bulb. Here is a helpful link about fast blinking turn signals and how to fix them. Hope this helps.

https://www.2carpros.com/articles/turn-signals-blink-rapidly
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Thursday, January 17th, 2019 AT 3:31 AM
Tiny
VERNALEWIS
  • MEMBER
  • 8 POSTS
Thank you for answering my problem. But, I have checked bulbs. There is no power to right rear for brake and turn signal only park light on right rear and front right signal that blinks fast, left side lights are okay.
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Thursday, January 17th, 2019 AT 6:16 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hi Verna, are your license plate lamps working?
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Thursday, January 17th, 2019 AT 11:37 PM
Tiny
VERNALEWIS
  • MEMBER
  • 8 POSTS
Yes.
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Friday, January 18th, 2019 AT 3:43 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

I'm just adding this diagram to help. This is for the rear lights to help check the circuit. There are more diagrams we can offer you. Hope this helps and thanks for using 2CarPros.
Danny-
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Friday, January 18th, 2019 AT 4:55 AM
Tiny
VERNALEWIS
  • MEMBER
  • 8 POSTS
Thank-you, Danny. For the right side there is no power at brake switch only for left. So I jumped switch, brake light works. There are two relays for the left tt relay. You can hear or feel the right light relay nothing. Can't fine signal flasher sounds like it is in the multi-switch. There is power and ground at the right tt relay.
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Tuesday, January 22nd, 2019 AT 6:02 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hi Vernal, it's Alex. Great to hear your running the problem down. Is there anything else we can do to help?
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Tuesday, January 22nd, 2019 AT 9:24 PM
Tiny
VERNALEWIS
  • MEMBER
  • 8 POSTS
IS there any way I can bypass? Shouldn't there be flashing signal coming from multi-switch on a wire?
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Wednesday, January 23rd, 2019 AT 4:54 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hi Vernal, Here is a wiring diagram with the hazard switch in it. I hope this helps. Let me know if there anything else we can do for you. Thanks, Alex.
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Wednesday, January 23rd, 2019 AT 2:00 PM
Tiny
VERNALEWIS
  • MEMBER
  • 8 POSTS
Thanks Alex, The diagram was to blurry for me to read. Could I get another showing from the front to rear. Thank-you
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Sunday, January 27th, 2019 AT 5:11 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hi Vernal, Here are the wiring diagrams you requested. I hope this helps. Thanks.
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Sunday, January 27th, 2019 AT 11:49 PM
Tiny
VERNALEWIS
  • MEMBER
  • 8 POSTS
Will guys i'm back for more help. Thank you for everything. I have got a short I believe with negative. Terminal off and test light connected to battery negative and negative. Cable tester lights. So I removed power wire from battery. Positive to pdb. And ran a new wire, still a short until I disconnected wires from brake master cylinder. Replaced power to pdb again test light came back on even with brake master plug still removed. Wire from BCM flashes fast. Thanks for your help.
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Tuesday, February 19th, 2019 AT 1:47 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

This sounds like a BCM failure to me but to be sure lets rung down the wiring diagrams flowing this guide:

https://www.2carpros.com/articles/how-to-check-wiring

You can do a CAN scan as well to help with the diagnosis.

https://youtu.be/InIlnsjOVFA

Check out the diagrams (below). Please let us know what happens. If the BCM is bad you will need to get it programmed which will run about $130.00 at a shop.
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Friday, February 22nd, 2019 AT 1:17 PM

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