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The only way to turnoff your DRL is to put in a voltage control relay that will only let the power thru say at 10V when head lights are manually turn on. You don’t want the voltage control relay much higher than that in case you alternator goes out. The relay are about $ 80.00 a piece you would need two one for each side. They need to handle 5 AMP so a diode won’t work very long before burning up.
If your handy with 12v wireing you could always rewire the headlights around the DRL Box.
 
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