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Normally this condition is the result of a poor body ground connection. Testing for this can be deceiving. At the static(nothing on) condition, testing can show a good ground. However when a circuit is excited, it has a determined resistance and a set current flow. If the ground connection to this or a branch circuit is loose, corroded, or broken wire. This will allow just enough connection to show as being good, but not good enough to complete the circuit with the required amount of connection when energized.
Ok. If they turn on by them selves. Even at night when the key is removed from the vehicle it may be the day time running light sensor. But with the key out this should not happen. You may have an issue with your security system.
parks are part of headlights , in that they run at any time
for safety EVEN KEYS in pockets.
so are keys in pocket?
and lights off
then it can be only 2 things.
a welded (my name) relay, (contacts fused is the tech reason)
or the switch is bad.
a voltmeter and 1min work and bam, the answer.
some cars have no relay.
so its the switch.
the schematic is at alldata.com its there, see it and how simple.
on new cars the computer brain, runs this stuff. (vastly more complex)
This is the way they were made, and unfortunately, I know a few times I wanted to turn mine off too. The only other way to keep them off when running the engine at least, Is before starting, to engage the parking brake. Then you can start the car and turn the lights off. Sometimes it's at least useful when you want to park at night with the car running, but not have your lights lighting up the block!
Most of the time with a GM type vehicle to get the headlights off while engine is running and vehicle is in park you just have to put the parking brake on only a click or two. That or sometimes you have the ability to turn them off by the headlight switch which is normally turned to automatic. If you turn it all the way to the right it should turn them off.
You will need to most likely replace the lock cylinder and the ignition switch, sounds like a worn out parts issue. This should cure your problems with the lights and any other strange electrical problems.