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93 deville electrical issues

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I have an issue with my high center brake light not working aswell as the courtesy light in my trunk doing nothing. Are these two possibly linked somewhere I havent located yet? I have checked and replaced all fuses I have located, the brake light switch has been replaced aswell as the tccc switch and no luck, so just wondering if someone has found any other possible causes for one or both of these lighting issues? thanks for any idea anyone can share with me, Im at end of my rope with them

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when something isnt getting power its time to get out the multimeter or test light and trace back to where the power is stopping. A wiring diagram would help greatly, either check a chiltons/haynes or look on autozone.com to see if they have anything you can use. Follow the wires to see what the power goes through before it gets to those lamps.

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