If the 2 resistors are joined together without the earth connection then current from a live blinker wire will flow through both resistors to the other blinker wire as the LED blinkers require very little current to operate, much less than that lost (converted to heat) by the resistors. 
I've been mindful of our history since you joined the forum.  LY was worse drought than the year before but this year is looking promising.
				
			 
			
		 
			
				
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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