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You find a wiring diagram for the headlight system for an 06 grand prix and then you get into the maze of wiring for this vehicle it isnt like the old times when you had a headlight switch with a built in circuit breaker a dimmer switch and the headlight bulbs maybe a fuse for parks sometimes a relay in the circuit but it was simple and easy to figure out. Totally free buick wiring diagrams how to restore headlights permanently how to test a relay the correct way duration 654 ratchets and wrenches 1459969 views 654. How to wire up lights in your hotrod wiring up your lights doesnt have to be too complicated thats why so many people have trouble with dim headlights the easy way is to use relays so lets get to wiring the wiring diagram below will get you good bright lights without overloading the switches and wiring . Hey guys i need a wiring diagram for the front headlights of my 2004 buick lesabre custom hey guys i need a wiring diagram for the front headlights of my 2004 buick lesabre custom we cant get the dtrl relay to activate where is the automatic sensor for the headlights quote reply jun 8 2013 . 1999 buick regal where is headlight relay located answered by a verified buick mechanic all other lights are oki need a wiring diagram for the headlights as my service manual does not show them where is the headlight relay 5 pin located on a 1999 buick century what are the wire colors attached to it