6.7 - Lights On Warning Buzzer ( ,  )

A simple 10 min. fix for anyone who has left their lights on and drained the battery.

Go to any electronics shop and pick up a 12 volt relay and buzzer. Wire the buzzer through the normally closed (NC) contacts on the relay, and wire one end of the relay coil to the negative side of the buzzer and a common ground. You need access to a circuit that is hot when the lights are on to wire the buzzer to, and an 'accessory' circuit that is hot when the ignition is on e.g. next to the lighter. The lighter has both an accessory circuit and an instrument light.

Pull it out of the dash and wire the (+) side of the buzzer to the light wire, that way the buzzer comes on when the lights are on. Wire the common ground to the ground on the lighter shell. Wire the other end of the relay coil to the hot lead for the lighter, so when the ignition switch is on the relay will be energized and the contacts will open, breaking the connection on the buzzer.

There is plenty of room to jam the stuff down into the dash before you replace the lighter. Epoxy glue can be used to glue the relay to the side of the buzzer and to cover the relay leads and solder joints