mobile-menu-icon
GM Authority

Reply To: 2004 Century 3rd Brake Light wire polarity

July 13, 2020 at 12:22 am #609734
WyrTwister
Participant

Check the red wire to chassis ground . Check the yellow wire to chassis ground . The wire that tests 12 VDC to chassis ground is positive .

God bless
Wyr

Subscribe to GM Authority

For around-the-clock GM news coverage

We'll send you one email per day with the latest GM news. It's totally free.