The Ford Barn

dlfrisch · 03-21-2015, 10:15 PM

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.

Pete · 03-21-2015, 10:22 PM

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.

Mike V. Florida · 03-21-2015, 11:04 PM

This is the one you are referring too,

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

Jacksonlll · 03-22-2015, 09:51 AM

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.

C26Pinelake · 03-22-2015, 09:57 AM

Quote:

Originally Posted by Mike V. Florida

This is the one you are referring too,

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

Mike. I am truly impressed. You have your fingertips on the pulse so to speak. Whenever a product is mentioned you are the first to identify it. You are a tremendous resource. Wayne

Jacksonlll · 03-22-2015, 12:04 PM

Sponsored Links (Register now to hide all advertisements)

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

Tom Wesenberg · 03-22-2015, 12:35 PM

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.

03-21-2015, 10:15 PM	#1
dlfrisch Senior Member Join Date: Feb 2014 Location: Florida - 32128 Posts: 416	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.

03-21-2015, 10:22 PM	#2
Pete BANNED Join Date: May 2010 Location: Wa. Posts: 5,423	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.

03-21-2015, 11:04 PM	#3
Mike V. Florida Senior Member Join Date: May 2010 Location: Florida between Sarasota and TampaSouth Florida Posts: 14,054	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 __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

03-22-2015, 09:51 AM	#4
Jacksonlll Senior Member Join Date: Jul 2012 Location: Michigan-- Member of Oakleaf of MARC Posts: 1,686	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.

03-22-2015, 12:04 PM	#6
Jacksonlll Senior Member Join Date: Jul 2012 Location: Michigan-- Member of Oakleaf of MARC Posts: 1,686	Re: Buzzer / Beeper - when light are left on Sponsored Links (Register now to hide all advertisements) 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

03-22-2015, 12:35 PM	#7
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	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.