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				05-21-2022, 01:04 PM
			
			
			
		  
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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, 05:47 PM
			
			
			
		  
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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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		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, 03:01 PM
			
			
			
		  
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					Join Date: Aug 2011 
					
					Cobra Make, Engine: ERA 427 
					
					
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		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, 03:08 PM
			
			
			
		  
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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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	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.  
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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				05-22-2022, 06:14 PM
			
			
			
		  
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					Join Date: Aug 2011 
					
					Cobra Make, Engine: ERA 427 
					
					
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		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, 06:27 PM
			
			
			
		  
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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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	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 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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				05-25-2022, 06:44 AM
			
			
			
		  
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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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		Second what Patrick said - easy to find locally. 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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				05-25-2022, 11:04 AM
			
			
			
		  
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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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		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, 11:59 AM
			
			
			
		  
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					Join Date: Nov 2003 
					Location: New Britain, 
						CT 
					Cobra Make, Engine: Size 10 Feet 
					
					
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		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, 12:14 PM
			
			
			
		  
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					Join Date: Jun 2005 
					
					Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum 
					
					
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		Excellent.  No splicing required.   
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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				05-26-2022, 06:03 AM
			
			
			
		  
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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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		And excellent service! 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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