Buzzer / Beeper - when light are left on
 

Very recently, someone just had a thread about this situation. I could not find it, but ....

someone had a simple idea. I like the wiring schematic - wire from your tail light wire to a 6VDC buzzer, then through a IN4003 silicon diode and then attached to the generator output terminal. Electrically, it is a neat circuit, but I doesn't work using a 6V output alternator. Alternators have built-in diodes to convert the AC output to a DC output. Using the old original generator idea works OK. When the engine is shut off and the lights are left on the buzzer will sound. This warning circuit is OK if the lights are left on. When the generator is in use (putting out current) and the buzzer does not sound it is because, the circuit has the same polarity on both sides of the buzzer. When the engine is shut off the circuit now completes an electrical path through the generator and its internal wiring loops to a + gr. and with the light switch turned off and the generator not putting out current, the other side of the buzzer also has a + pole. (I think...! ) The positive electrical ground, always has me confused anyway, but at my age it's getting ....wht was I saing?

Does anyone have or maybe suggest a simple idea for this circuit? I have a 6V alternator in my '30 coupe.

Re: Buzzer / Beeper - when light are left on
 

Somebody makes a small solid state module that does what you want but I don't remember where I saw it. Maybe on Ebay or in a ham radio magazine.

Re: Buzzer / Beeper - when light are left on
 

This is the one you are referring too,

https://www.fordbarn.com/forum/showthread.php?t=164328

Re: Buzzer / Beeper - when light are left on
 

Sorry if this is a repeat. Thought I wrote this last nite, but can't find it. I simply mounted a brake light switch in the door jam of my roadster and as the door is opened, it lets the rod out and the switch them connects the tail light circuit to a Radio shack 6 volt buzzer and away we go. Tail light to switch, switch to buzzer, buzzer to ground.

Re: Buzzer / Beeper - when light are left on
 

Re: Buzzer / Beeper - when light are left on
 

I just made a short video of my set-up to let me know when my lights are on.
https://www.youtube.com/watch?v=it7C...ature=youtu.be

Re: Buzzer / Beeper - when light are left on
 

If you don't want to look at the ammeter, or you don't trust it's reading, then you might try an LED volt meter wired to the tail light wire. When the lights are on the meter will be on and reading the battery voltage.