At 03:39 PM 9/4/03 -0700, you wrote:
>The front passenger side parking light/corner marker on my van doesn't work,
>but the turn signal does.  I had this problem before, but then it started
>working again.  So, assume it's a loose connection of some sort.  Since it's
>the same light, the bulb is obviously working.  What might the problem be
>and where should I look to troubleshoot?

Same bulb, but two separate filaments. Take the bulb out and make sure the
filaments are both fine.
Clean the contacts on the bottom and the side to make sure that the bulb
isn't the problem, then look into the rusty socket that it works in.  Clean
the heck out of it, scraping through the rust and copper oxide to get good
conductivity between the contacts on the socket and the bulb, and the
grounded sides.  Check to see if that ficed the problem.  If so, pull the
bulb back out, put a bit of electrical grease on it to keep it from seizing
up in there when the oxidation sets back in, and put it all back
together.  If you find that your socket is so badly corroded that cleaning
it disintegrates it, keep your eyes open for one of our Arizona based
people to mention that they're parting out a van.  Nothing rusts in Arizona.
If the problem wasn't in the socket, trace the wire back from the socket to
the switch to find the break.  If three parking lights work, the problem is
after the switch.  If the turn signal in that socket works, the problem is
before the brown wire back to ground.