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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 high beam mode, but this diode solves that. MAKE SURE THE SIDE OF THE DIODE WITHOUT THE STRIPE IS IN THE 10 PIN. The diode allows electricity to travel in only one direction.