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Blown fuse ,bad headlight switch,or wiring issue.
the tail lights have there own fuse and are powered through headlight switch. Do the front running lights come on? If none of them work, switch could be bad if front work and rears dont, check bulbs and power to them when lights are on
Common problem or complaint, Dash lights out or rear running lights not working. Most common problem for this is the round bulb for the brake and running lights flatten out over time and touch each other inside the bulb holder normally the ends should look like nn but when flattened out look like this _ _ and end up touching and shorting out, replace both bulbs. And on GM cars front running lights can cause the same thing so always check all four running light bulbs(Front and Rear). If it has the turn signal and running lights on the same socket always check this first. G.M. had built into it's wiring system a fail safe that if one running light went out the dash lights will not come on, this is so that you don't get a ticket for a running light or brake light out.
Make sure bulb replaced is the required 2 way or 1 way. If you're sure you put in the right bulb type (1 way or 2 way) 6 or 12 volt.. bulb model marked on side for replacement (Check carefully). Assuming its the right bulb type and still blinks fast, you will have to replace the socket. Sockets do get corroded and worn. Disconnect the battery, cut positive then cut negative. Wire up new socket same way using wire connectors. Tape up connections after.
Should then work.
Make sure before you do this you have the right bulbs in all sockets (front and rear) and that all lights work 1st. One failing light front rear same side can cause this problem.
Go to a scapper to get a socket.. just cut it off a wreck... take a couple of them. There cheap.
Good luck
The only way a lot of bulbs can burn out at once is overvoltage. Check your charging voltage with the car running, using a multimeter. Should be 13.8 volts; with the car off, about 12.6.
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