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iirc the dtrl run off them as well and you would have to disable them. i dont know for sure though..i could also see it messing with the bcm...just a thought
'08 Tahoe.... already does this from factory. Engage high beam and lows stay on. Factory option from 07 on.
Fogs still go off when high's are engaged but there is a thread on here detailing how to override that.
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