2004 chevy trailblazer_ls
look what i got today!!!!!
12-VOLT (POSITIVE) REVERSE LAMP CONNECTION (OPTIONAL)
8.1 Route the white wire to a reverse triggered wire.
8.2 Using a multimeter, check for a wire at fuse block or in driver's step well area that tests for positive when shifting the vehicle into reverse.
8.3 Using a butt connector, scotch lock or t-tap connector, connect the wire to the reverse circuit wire at this time.
NOTE: The use of this optional wire is at your discretion. When vehicle is in reverse, it un-dims the mirror for better visibility.