I'll add my version to what David said.

Right here

https://shufti.blog/2010/05/15/headlight-on-warning-chime-mod/

Alistair

> On Jan 16, 2017, at 7:47 AM, John Lauterbach <john@JHL.MGACOXMAIL.COM> wrote:
> 
> My Son (18 last June) is now the main driver of my Vanagon.  He woirks
> the graveyard shift at a local grocery store restorcking the shelves.
> When he gets home just after 7 a.m. in the morning, he turns the van
> off, sees that the headlights go off, and goes to bed.  Of course, the
> parking lights are still on.  Unlike more contemporary vehicles, there
> is no buzzer that goes off when the key is removed and the lights are
> still on.  How do I rig up something that sounds a buzzer when the
> lights are on, but the engine is off?
> 
> Thank you,
> 
> John