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This diode installation allows all of the lights to remain on simultaneously when the high beams are activated on GM vehicles. The diode is super easy to install, you need $2 and 10 minutes. 9 of those minutes will be spent congratulating yourself.After diode placement your lights will function as follows: In auto mode- whenever your lights come on automatically the fogs will be on also. Low Beams & Fogs- Only Low Beams & Fogs will be on High Beams- Low Beams, Fog Lights, & High Beams will all be on (normally by default) The vehicle turns off the fogs when in h