headlight warning buzzer

how do I install a buzzer to sound when the car is turned off and headlights are still on?johno

Your headlight wire should have +12v on it and your Ignition line from steering column should be at Ground when the car is off, so those would be the wires to hook up to the coil of the relay. Then get yourself a little buzzer, Ground the black lead and use the relay to switch +12v to it.   30=+12V, 87=to buzzer red wire, 85=Headlight wire, 86=Ingnition wire.

They sell tiny headlight warning buzzers at local autoparts stores. I've bought one before and it came with little clips to plug it right up to the fuse box. You hook the hot to the headlight fuse, and the ground to any ignition fuse. Simple 5 minute installation! And it only cost like 2 or 3 bucks. That less than the price of one relay!