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I was wrong about this. Now I don’t know if upgrading the alternator is responsible, but the DRL voltage was ~12.6v on the “low” setting which the Morimoto sees as high enough to toggle the full brightness.

I just bought a 4ohm 75W resistor from Mouser and spliced it in place of the factory resistor pack in the left front fenderwell. This brought the voltage to ~9.0v and the Morimoto does what it’s supposed to.

I will update again if this ends up not working after some time or overheating after more drive time and the summer have passed.
 
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