What is the problem when your headlights and tail lights are suddenly not working?

This is a common problem check the ground on that tail lamp assembly as you step on the brake the power sent to the bulb can not find ground and is returning thru the turn signal bulb so 2 positive sources keep the bulb out.

mporteous, It sounds like you have a light switch problem. I can't think of any other reason for the running lights and tail lights not working in this situation. Are your brake lights working when the headlights are off and how about when they are on? Do your four ways hazard lights work in these situations? Try all the lights under these conditions. The reason the left turn signal blinks very fast is because one of the bulbs are burned out. Try the left signal and one light (front or back) will stay on and the other will not come on at all. Replace the bulb that does nothing. Do this before you try all the lights in different situations. I think that you will have to replace the light switch. Good luck with this.

will u have a few more switches and relays to check/change brake light switch and relay/and headlight switch

is there a curcit board in the rear tail light assembly if so change it

The Blinkers and the Brake Lights are the same bulb. So check the brake light switch. Flashers use a different flasher unit, than the turn signals

most likely a bad ground in your electrical system; consult your local mechanic

it is in the flasher switch for hazards

Check the relay under the hood. Either that or you have a short in the ground to one of your brake lights; they're run in a series.

there are two turn signal flashers under dash one on fuse box and one next to the light switch have to look up behind dash behind light switch for second I had same problem

Just found the answer on another site. Sure enough went out removed the 3 philips head screws in the steering column opened it up and walla a wire connection had pulled itself free. When my son uses my truck he always uses the tilt steering, when I get in I have to readjust it. because of this the wire connection pulled itself out. I simply pushed it back in an blinker and brake light are now working. My husband is now trying to figure a way to secure the wire connection so it doesn't pull itself out again. Hope this helps others, either by saving the cost of a dealership or machanic or from getting rear ended.