RonA Posted June 9, 2014 Report Share Posted June 9, 2014 Hi Does anyone have a simple wiring diagram for a buzzer warning if the headlights are left on when the ignition is switched off? RonA Quote Link to post Share on other sites
RogerH Posted June 9, 2014 Report Share Posted June 9, 2014 Hi Ron, haven't got the diagram but easy to explain. Take a 12V supply from the ignition coil (+ connector) to the coil of a change over relay. With ignition on this moves the relay arm to normally open (NO) contacts that are NOT connected to anything. The other set of relay contacts (normally closed, NC) have a feed coming from the headlights. The relay arm is connected to the + side of a 12v buzzer. The -ve of the buzzer goes to earth . This works well for its main objective. However if you need to have the lights on with the engine off you will temporarily need to pull a wire off the relay. Relay = 12V SPDT (single pole double toggle). Buzzer - 12v From Maplin etc Roger Quote Link to post Share on other sites
Peter Vernon Posted June 9, 2014 Report Share Posted June 9, 2014 Ron, try this, it is a very simple solution and you can use the £2.50 12v round buzzer from Maplin. You will need to hide it as it is white!! http://www.elises.co.uk/diy/buzzer/buzzer.jpg Quote Link to post Share on other sites
RonA Posted June 10, 2014 Author Report Share Posted June 10, 2014 Hi Chaps Thanks for the info, I nearly got caught out a couple of weeks ago returning during the day with the headlights on in bad weather, fortunately a neighbour noticed, maybe it's an over reaction, I haven't done it before, I'll give it a bit of thought. RonA Quote Link to post Share on other sites
RogerH Posted June 10, 2014 Report Share Posted June 10, 2014 Hi Ron, it is worth doing if it only saves you once. Daylight running in bad weather is the killer. It will cost less than £5 and you don't even need a circuit board. Roger Quote Link to post Share on other sites
Grahamgl Posted June 11, 2014 Report Share Posted June 11, 2014 Hi Ron, I know this is from an MG site but it works and is easy to install. I fiited it to my 4A (using the "modern method". Graham http://mgaguru.com/mgtech/electric/et245.htm Quote Link to post Share on other sites
RogerH Posted June 11, 2014 Report Share Posted June 11, 2014 Hi Graham/Ron, the first diagram is what I was trying to describe. The ignition position is the white (coil) wire. Roger Quote Link to post Share on other sites
matttnz Posted July 6, 2014 Report Share Posted July 6, 2014 Thanks guys-fitted this today with piezoelectric buzzer between light switch and door switch. The wires are virtually side by side, cost less than $5 of the local NZ peso and works a treat. Was convinced I was going to leave the lights on at some stage... Quote Link to post Share on other sites
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