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05-21-2022, 12:04 PM
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CC Member
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Join Date: Aug 2011
Cobra Make, Engine: ERA 427
Posts: 89
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Not Ranked
Right Side Brake Light Not Working on 821
My right side brake light does not work. Troubleshooting this problem I have checked all of the fuses including the 2 amp fuses under the steering column and the taillight bulbs and all are good. All of the lights work except the right side brake light. I checked for 12v at the trailer relay under the dash. The yellow wire has 12v but the green wire does not when the brakes are applied.
My conclusion is that the "Taillight Relay To Trailer" has failed.
Am I missing anything here? Any other possibilities?
BD
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05-21-2022, 04:47 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Swap the green and yellow connections on one side of the 2 amp fuse block and see if everything now works properly except the left brake light.
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05-22-2022, 02:01 PM
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CC Member
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Join Date: Aug 2011
Cobra Make, Engine: ERA 427
Posts: 89
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Not Ranked
Patrick -
I made the wire swap as suggested. With the swap the right side worked and the left side did not. Doesn't this confirm my suspicions about the trailer relay board?
BD
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05-22-2022, 02:08 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Whodeeny
Patrick -
I made the wire swap as suggested. With the swap the right side worked and the left side did not. Doesn't this confirm my suspicions about the trailer relay board?
BD
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Yes it does. |
05-22-2022, 05:14 PM
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CC Member
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Join Date: Aug 2011
Cobra Make, Engine: ERA 427
Posts: 89
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Not Ranked
Ok. Thanks for your help. I will call Bob or Peter on Monday and order a replacement.
BD
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05-22-2022, 05:27 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Whodeeny
Ok. Thanks for your help. I will call Bob or Peter on Monday and order a replacement.
BD
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They're pretty easy to source. If you have a nice locally owned NAPA or the like just stop in there tomorrow and tell them you want a three in to two trailer relay like this:
https://www.amazon.com/CURT-58240-No...a-435721587525 |
05-25-2022, 05:44 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,533
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Not Ranked
Second what Patrick said - easy to find locally.
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05-25-2022, 10:04 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
But some are better than others. Some are "heavy duty" and seem to allow more current to pass. Some say they don't work with LEDs, some say they do. Here's a pic of the assembly so you can see how to pop it out and then replace the trailer relay itself. Before you do a "final install" double check that it works properly.
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05-25-2022, 10:59 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,028
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Not Ranked
I sent the whole assembly, minus the flasher, to whodeeny. He should get it in the next couple of days.
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05-25-2022, 11:14 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Excellent. No splicing required.  |
05-26-2022, 05:03 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,533
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Not Ranked
And excellent service!
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