On a cold and frosty winters night I returned to the car after work to find a flat battery because I had left the side lights on. All I wanted to do was go home, but it was not to be. 45 minute wait then - 3 minutes with the AA man and the car was running - very annoying.
A quick search on ebay revealed a "lights on reminder" for £1.99 Basically it's just a simple 12v buzzer which you attach the positive to a lighting circuit (e.g. dash or side light feed) and negetive to a switched live (e.g. indicator power). Without looking at the wiring diagram in too much detail it seems that the switched live goes to earth once the ignition is switched off allowing current to flow to the buzzer if you have left the lights on. Well worth £2.
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