"lights on" alarm?

Yep you can get a headlights on kit from Jaycar.

Or you can just use any small 12 volt buzzer.

Don't know how I forgot that solution Yendor, which you suggested previously. It has simplicity, low cost and effectiveness going for it, after all.

I can remember the principle was that both wires of the bu22er would see 12v when the lights were on and the ignition on or on acc, but once the ignition went off, that created the 12v gap, sounding the bu22er.

Which wires should they go for if considering this?

Thanks again, Rick

That's correct Rick,

You would connect the positive of the buzzer to the headlight circuit and the negative of the buzzer to ignition circuit or you could use accessories.

With the headlights on and ignition off the buzzer will find an earth via the ignition circuit.

I am thinking of headlights on with accessories or ignition on.
But only parkers without atleast with the headlights off and just the parkers on it should give you quite some time before the battery goes flat.

Another alternative I always offered while installing after market alarm systems was if they ran both positive and negative door triggers to hook up the positive trigger to the lights if the vehicle ran negative door triggers (most do) so the alarm will trigger when you arm the car with the lights on, if you want to go that way ;)

Investigated last night.
Connect a buzzer between the ignition switch output and the lighting switch parking light output.
More info here... http://mgaguru.com/mgtech/electric/et245.htm

Just looked at my alarm diagram i think i'll wire a relay up to to the negative on arm wire that cuts the lights off when you turn the alarm on.
Pretty sure that's how most modern cars do it as well.

Easy fix - update vehicle and buy a GU . Its got a buzzer .

used the positive door switches on alarms so they give out a couple of chips to notify, using the negative out while armed to cut lights of will leave the relay charged while the vehicle is in a stationary position and can be a fire risk :)

Really alarms need a constant signal out while disarmed or your forever butting your head up against a wall on how to have your relays discharged while the vehicle is shut off I have always found :( viper has been good in making me some custom alarms tho and add on units they produce for all there alarms are always a bonus :)