I have a 2002 E350 that's been having headlight issues. After I drive for a bit, when I turn the van and the headlight switch off, the headlights come back on at a dim setting about 20 minutes later. Van is totally off, headlight switch is off, but the lights come back on on their own. I replaced the headlight switch this week, no change. I've checked for a daytime running light module and can't find one (although it's possible it's just not in the obvious places -- I looked underneath the plastic case that's attached to the air intake under the hood at the front of the van, and also behind the headlights). Has anyone had this issue before? Any other places I should check? I'm wondering if there's some custom wiring situation happening -- this van used to be an Xfinity fleet vehicle and has a lot of custom components.