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Rene;
The (Velleman ) Kit which Dean refers to uses a couple of CMOS chips which will draw power all the time (even when IGN is OFF)...now as CMOS devices consume basically fleapower, from an electrical standpoint, this is not an issue (your car battery selfdischarges at a rate faster than the microamp load of these little devices, so it will never even know its there!! ), so if you don't have a philosophical problem installing a sensitive solid state electronic device in your car, I would say for $15, that kit is hard to beat...
...on the other hand, if you prefer something even simpler and more robust (you didn't think that was possible did you!), install a simple relay with a "Form C" contact, hooked up to have the coil powered ONLY when IGN ON, and to give you a node with power (only) WHEN IGN IS OFF. Then, power a beeper/buzzer across that terminal to the light switch output...DONE! This solution is even simpler, with only two components and hook-up required! I can supply circuit if required.
RJ; Thanks for reference, as always!
Bill; If you had more than a volt drop from the light switch to the headlights, I suggest it wasn't in the wire, but at connections (like the six pin connector or maybe ground at headlight harness). The original wire guage is perfectly adequite for the original load, even Halogen upgrades! Your upgrade to relay power will certainly work, but it is IMO a use-a-cannon-to-squish-a-fly-solution, and waaaaaayyyyyy more than Rene needs to do (from standpoint of complexity AND time to implement), simply to get a headlight reminder function.
Cheers
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