03 Durango- rear tail lights. All new bulbs. New housing. Reverse light doesn't work, blinker flashes fast when brakes applied (normal with brake not applied), with headlights on brake lamp only lights when brake actually pressed (should light up with headlights on). Any suggestions?

So your taillights should have 2 bulbs in them. 1 that turns on when you turn your lights on and stays on until you turn them off. That same bulb should have a 2nd circuit that lights up when you press on your brakes. The 2nd bulb appears when your reverse gear is engaged. So if you have no lights on right you have to replace both bulbs and if you have no brake light on the left you just have to replace your rear brake light bulb.

The Bulbs Have 2 filliments in them if 1 is burnt out that would give you the fast not working tail light there may be an issue with the brake light switch located above the brake pedal on the arm.

Start by replacing the light bulb.

most blinkers uses relays, and when they flashes fast one light is out, but you replaced your burnt bulb might be a bad relay.

Your right rear turn signal bulb is blown.Replace the bulb and the fast blinking will stop.

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

Normally with the blinker blinking really fast, it's telling you that one of the bulb is blown, front or rear signals. Check your fuse, and fuse relay to see if it would fix the promblem

If the high level brake light works, then the brake light circuit is fully functional.

Brake light bulbs may LOOK fine, but can still have failed. Often folks don't notice that one bulb has failed until the second one has blown; it's then easy to incorrectly assume that the fault is more complex.

Try replacing the brake light bulbs: if that doesn't work then please report back for additional options.

You have a wire shorting out somewhere. Inspect from tail light forward. A test light will probably help you.

Traction Light has a traction system sensor going bad.
Blinker rapid flash- brakes applied, Need to replace dual function tail lamp bulb(brake turn
bulb)
Reverse light need shifter adjustment.
Gas gauge The sending unit in your tank is going bad replace it.