I have a older Sonata that sometimes sits around undriven.

I noticed one day that when I turn on my headlights the brake lights turn on (all 3 of them) When pressing the brakes you can see a little more juice goes to the lights but it's not like normal braking.

Inversely when my headlight is off the brake lights work like they should, but when I press the brakes all my dash lights turn on like they would at night when I turn on my headlights. Headlights do not power on though when braking with them off.

I bet it's a bad connection, but can't guess where. Anyone have this issue before or thoughts on the process I should take to troubleshoot this?

 

wow thats a crazy issue ... dont know why, just never heard of something like this before