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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
When you disconnected the headlight switch did the parking lights still stay on with the switch disconnected?
This means that there is a short after the switch. I would start with checking the relay and if the relay is not stuck closed providing power to them then you will have to check the wiring for a short of two powers thus providing power to the power for the parking lights. A normal functioning relay only provides power when the low side circuit is completed with power thus closing the relay and providing the high side to the circuit, what can happen is the contacts can stick and cause it to stay closed thus providing power at all times, pull the relay and swap with another to see if that resolves the issue.
Thank you!- Joe
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Swap that relay for another and see if that fixes the problem please.
Ok, so pulling it turns them off, this means the short is before the relay, it will not be on the high power side as that does not engage the relay but instead will be on the low circuit side meaning from the headlight switch. So somewhere between the headlight switch and that relay is the short.
No problem at all, my pleasure. Please let me know if you have any further questions.