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Old 01-22-2014, 08:25 AM
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headlight buzzer

My brother has an early 1990's Civic and it has no headlight buzzer. He does not pay attention and leaves the lights on all the time and wants me to add a buzzer.. I know a 12v peizo buzzer from Radioshack and a diode will fix it up. Just need to make sure I have the wiring right..

One lead goes to the parking lights, and the diode stripe would point to the parking light circuit. Other lead would go to an ignition circuit. This would make the buzzer buzz when the ignition is off and the lights are on, but not if the lights are off with the ignition on right?

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Old 01-22-2014, 04:46 PM
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Where are you picking up the ground for the buzzer? At 1st read it looks like you will have two pwr sources tied into a buzzer...... either will make the buzzer sound. I think you will have to use a relay.

In this circuit, If the.......

Headlights are off the buzzer will not sound.
Headlights are on and the ignition is on, the relay is energized and the buzzer will not sound.
Headlights are on and the ignition is off, the relay will not energize and the buzzer will sound.

When the ignition if off there is no additional drain on the battery caused by the relay. Because the relay will be energized every time the ignition is on, the relay life may be shortened. There may be a better way to do this....... I'll Think on it
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Old 01-22-2014, 05:23 PM
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If you add a 2nd relay, the circuit will be dead unless the headlights are on, which will prolong relay life. I couldn't edit the 1st post
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Old 01-22-2014, 05:51 PM
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I thought that an open circuit would go to ground? so if there was 2 power sources and one was removed, the circuit would complete, except with the diode in place it would not work the wrong way ( ign on, lights off )
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Old 01-22-2014, 08:22 PM
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All a diode does, in lay terms, is provide a one way path for electricity to flow, it's not a switch or a gate, it prevents current from flowing backwards.

Lets say you have a wire from the headlight switch providing +12 to the + side of a buzzer. You also have a wire from the ignition switch providing +12v to the same + side of the buzzer, this one you put a diode in-line with the stripe towards the buzzer (allowing current to flow to the buzzer. The other side of the buzzer gets a ground.

When you turn on the headlights current will flow to the buzzer and it will sound, the diode prevents the current from flowing to the ing switch. Now with the lights on, you turn on the ing switch current will flow from the ing thru the diode to the buzzer and it will continue to sound. The buzzer will continue to sound the whole time until the lights and ing are turned off, if either one are on the buzzer will sound.

Let's say the lights are off and you turn on the ing..... the buzzer will sound and the lights will come on because there isn't a diode preventing current from flowing to the light switch, Let's say you put a diode in both wires..... the alarm will sound when either are turn on and will stop when both are off.

You can use a SCR or transistor with a voltage reducer to accomplish the same job as both relays......... but if you don't understand how a diode works, you'll be lost very quickly trying to wire that up.
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Old 01-22-2014, 08:29 PM
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door

The attached schematic shows a wiring method that will sound the buzzer only when a door is opened w/ignition off and lights on.
The diode is used to prevent any back-feed via the dome light and relay coil when the doors sws are open (however small that back-feed may be).
Tried to keep it simple.

vicrod
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Old 01-23-2014, 03:43 AM
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Nice design Vic, more efficient than what I posted.
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Old 01-23-2014, 05:44 AM
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revision

See attached revised drawing.
Added another diode just to be sure there is no feedback into lighting crt. which could cause the buzzer to sound. It would depend on the type of buzzer selected.

vicrod
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Old 01-23-2014, 09:51 AM
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This car actually has no door switches for the dome light ( base model 1992 model ).. I got a buzzer working anyway. 2 diodes and then hooked the buzzer right into the fuse box under the dash. IGN off lights on buzzer sounds, but not the other way around and it does not back feed the circuits.. The buzzer also says it's diode protected so I probably only needed 1 diode but they come in packages of 2.
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Old 01-23-2014, 03:34 PM
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I have bought the GM accessory one for all my older cars over the years. Bought one, put it right in my Rambler in minutes. You plug it into fuses on the fuse box. Not on the Rambler because it has no fuse box but you get the idea.

I am trying to come up with the GM one but found this Ford Version. http://www.ebay.com/itm/1965-1967-FO...26426e&vxp=mtr

Brian

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Old 01-23-2014, 07:10 PM
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Yep. I thought I had a ford buzzer here somewhere but couldn't find it.. The $5 buzzer and $2 diodes do the same thing tho. I went right to the fuse box and for now just jammed the wire in with the fuse, but when the fuse jumpers which plug into the fuse box get here ( which are on order from Napa ), I will put it togther correctly.

On the 1992-1995 Civic, just takes connecting the positive to fuse number 19 ( head/ park lights ) and the negative to fuse number 23 ( acc/ run ). All from the under dash fuse box.

The buzzer I got is rated for 4-28v so it would work in a 6v application also.
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