David b has the solution:

"Headlight Buzzer

Take a polarized buzzer that won't buzz if the polarity is backwards,
and solder on the ends of the leads two little tabs of flashing
copper, 1/4" wide and 3/8 long.

Pull fuses S20 and S19.  Insert the copper on the positive lead
partway into the S20 socket and plug the fuse back in so the copper
is trapped between fuse and socket contact.  Do the same with S19 and
the negative lead.  Try the headlights.  Attach the buzzer nearby
with foam mounting tape.

S20 is the parking light circuit, and S19 is connected to the 15
circuit that is switched by the ignition key.  If lights are on but
key off, the buzzer will sound.

Yrs,
d

--
David Beierl -- dbeierl@attglobal"

Jim

> On Jul 16, 2015, at 6:03 PM, Tyler Hardison <tyler@SERAPH-NET.NET> wrote:
>
> I did it again. I got to the office and left the headlights on.
>
> Was there ever an idiot buzzer for the Vanagon if you tried to exit the bus
> with the lights on?
>
> --t