It sounds like your headlight switch has a bad circuit.
I would start with the trailer wiring if you have a tow package. Most wires are well protected from the factory, but teailer plug wires are after market and hang under the bumper. Very exposed.
Shorted circuit some where. 1st check all the bulbs to see that they are not shorting in socket or in bulb. 2nd check wires running to lights for visual problems.
Check your ground wired, The system is backfeeding.
SOURCE: turn signal
Go to your local NAPA auto parts store and get replacement tail lights circuit boards. This should solve the problem. I did for my daughters van.
SOURCE: Brake lights dont work, Turn Signals all goofy
First thing i would do is chg. the break light switch, and make sure to chk. all grounds around tailights, sometimes if there is a ground problem it will travel back thru the hot wire to get a ground, witch in turn makes everything go wackey.
SOURCE: 2002 ram 1500 single cab ext light issues
sounds like a faulty underhood fuseblock..have seen lighting issues with these components
SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
SOURCE: brake lights don't work when
{: ) Looks like your lightings got haywired. Have you had vehicle repairs recently? Anyway, it seems that you have poor grounding connections for the affected lightings. Some circuits share common ground, and ground terminals are strategically distributed on the vehicle. If these grounds don't have good contact with the body, chassis, or engine ground, circuit functions are badly affected. Thats why these ground points should be inspected and kept clean and tight, maintain that good wire and terminal contacts.
We can start with G100 located at the Left Front of the Engine Compartment on the left front body mount. See diagram below:
Check out also G401 which is located in the chassis harness, mounted to the left rear Body mount. This ground point is shared by the rear lamps like the brakes, reverse, and rear signal lamps.
If possible check also other ground points that you may visually come across while on your search. Be sure also that fuses are all inspected good.
I hope we get lucky in finding and fixing a certain lamp function, if not all. Goodluck.
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