I have a 2015 Silverado and recently had a left rear turn indicator alert when using the turn signal. Saw the top bulb was not working and replaced the bulbs. After replacing the brake light and turn signal no longer work. I put the old bulbs back in and still nothing. Running tail light works at night, but no brake light, turn signal, or hazard.

any help would be greatly appreciated.

someone suggested it could be a loose ground. If that’s the case, where are areas To look for the grounds.

thank you