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More than likely there is a bad ground. The same ground wire that is used for the headlights is spliced into and used for the parking lights, brake lights and directional lights. The circuits for the brake lights, the brake light switch, the directions and directional switch are related. The circuits for the parking lights, headlights, headlight switch and high/low beam switch are related as well, but the only thing all these circuits have in common is their ground source. Any questions feel free to write back. Good Luck.
A lot of systems now work on grounds...it's good that you have power, however if there is no ground then the light will still not work. What car do you have?
The turn signal circuit is different from the parking lights. So the headlights would not be involved. You should have power on one side of the bulb for parking lights and the other for turn signals. If you have no power for the turn signal circuit, I would look at the turn signal switch. It powers each bulb separately.
A mechanic would check for power at the headlight switch and turn signal switch then go from there. Might be a fuseable link in the engine compartment.
check your fuses under the steering columb area, and also check fuses and relays, that is located in a power distribution black box under the hood, on the drivers side.
Check headlight lamps... then follow the wiring from the bulb connections back and make sure you're getting a good solid ground connection. It may have a loose, broken, severed grounding wire.. it's usually attached to the car body at some location not far from the headlights.
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