Built a "Headlights on warning circuit" for my 82 Honda and it worked! Whoo Hoo!

The switch (lower right) is for the glove-box light that has power when the parking lights are on. I spliced into the circuit for them using similar connectors so that the original wiring was kept intact. The yellow then long red wire goes to the radio fuse that has power when the ignition is turned to accessory (or otherwise on) and this is the the control for the relay. When the relay is not energized, i.e. the ignition is not to accessory, current flows from the glove box light through the buzzer (white thing) then to ground. When the ignition is in the accessory position (or otherwise on) then the circuit to the buzzer is broken by the relay being energized which goes to ground at the ground side of the glove box light.

I've been meaning to get this done for ages. It was also fun to tinker a bit with the result of less worry for leaving my lights on.

I'll have to make up a similar one for y 68 Mustang.

 

successful tinkerings are always way more fun!!!