Trickle voltage in headlights?

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Hi -somehting interesting happened when I removed my headlights to get then retrofitted at the Retro Shop. I removed the bulbs still attached to the wiring and wrapped in a paper towel. Came back 10 days later and noticed scorch marks on the paper towel - the halogen bulbs on both sides were very warm.

Is this normal that when the truck in not running, all light switches off, that there is a charge going to the headlights? Does this mean that the charge could drain the battery? I was not expecting this to hapen. Your insight on this would be appreciated.

By the way - I received my retrofitted headlights from Jeremy at the Retro shop yesterday. Today I'll install them. Thanks to all who recommended him.