Headlight warning buzzer

[P_Byrne]

Hey all,

How would I wire up a warning buzzer in a negatively switched zook?
I bought a cheap buzzer from super's, and when wired up as per the instructions, it buzzes all the time (obviously!)

Is there an easy way of doing it?
I'm sick of having to jump start my car :( and I'm not yet ready to make a new pos switched harness for the lights just yet.

Cheers,
Paul

[-Scott-]

How do you have it wired now? One wire to earth, other wire to "lights" signal?

I'd suggest try the "earth" wire to the "lights" connection point, and connect the existing "lights" wire to permanent 12V.

If your current wiring is something else, can you describe it?

Scott

[Ruffy]

You'll need a change over relay.

Hope tihs makes sense. The change over relay has an 87A terminal which is a normally closed circuit between terminal 30 and 87A. When the relay is powered the circuit between 30 and 87A opens. For the purpose of this excercise ignore the 87 terminal, use 87A only.

So, connect your buzzer power to the battery (fused of course).
Connect the 86 terminal of the relay to a good earth.
Connect the 85 terminal ignition power (coil or similar)
Connect the 30 terminal to the switched side of your head light earth.
Connect 87A to the earth of your buzzer.

With the igniton on the relay is energized and the earth circuit of the buzzer is open. If your turn the ignition off then the relay is de-energised closing the earth circuit and sounding the buzzer.
If you want to be able to leave your headlights on with accessories on the you need to connect terminal 85 to an accessory power instead of igniton.
Good luck. Cheers

[xl7fan]

G'day there, those cheap headlight buzzers usually wire up as follows: Red wire to headlight positive wire & black wire to positive ACC ON wire from key switch. The positive ACC ON wire when turned off leaks earth which gives ground for the headlight buzzer so when the headlights are left on 12v is supplied to the red wire for buzzer & earth is supplied to the buzzer from the ACC ON wire when its in the off position.

This should work.

Cheers, Matt.

[-Scott-]

G'day there, those cheap headlight buzzers usually wire up as follows: Red wire to headlight positive wire & black wire to positive ACC ON wire from key switch. The positive ACC ON wire when turned off leaks earth which gives ground for the headlight buzzer so when the headlights are left on 12v is supplied to the red wire for buzzer & earth is supplied to the buzzer from the ACC ON wire when its in the off position.

This should work.

Cheers, Matt.

For a positive switched vehicle, yes. Being negative switched, all three pins on the headlight will be at +12V when the lights are off.

[xl7fan]

Good point Scott, I should have read that a bit closer. Could hook up buzzer red wire to positive wire that supplies illumination lights for dashboard etc just means buzzer would also work if parkers were left on. Only question would be if car is regularlily parked with parking lights on.

[P_Byrne]

xl7fan,

Thanks for that idea, will probably work! At the rate the lights seem to be able to discharge the battery to completely dead I wont want the parkers left on either.

Ruffy - nice solution but I am a bit of a electrikary newb, so I need a simple solution to fill me in until I make a new headlight loom.

Will give it a go and let you all know!

Cheers,

Paul