switch off led when engine starts

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spaspecker

Copper - Posts: 59

Joined: September 07, 2006

Location: United Kingdom

Posted: February 20, 2008 at 4:43 PM / IP Logged

hi guys -

tried to cover this before, followed instructions here but that's not what I'm looking for, as the LED is lit all the time when the engine isn't running.

What I want is this: I have a pushbutton ignition setup in my car. I have got a new button that has a LED built in. I want to be able to put my key in the ignition, turn the key to switch on all the electrics etc. and have the LED light up. Then, when I push my start button and the engine starts, I want the LED to go out and stay out, until the next time I start my car.

Can anyone help?

thanks in advance

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: February 20, 2008 at 4:58 PM / IP Logged

Without using a programmable microcontroller thats going to be a pretty difficult task.

How about this:

wire the LED + to igniton through a relay (LED + to pin 87A, IGN to pin 30).

wire the LED - to ground

Wire the coil (Pin 85) of the relay through a diode to the starter wire. After the diode (between the diode and pin 85) make a connection to pin 87 of the relay.

Wire the other side of the coil (pin 86) to ground.

When you turn the ignition on the LED will get powered through the NC contact of the relay. When you crank the car the starter will energize the relay. Once the relay is energized, the ignition power will cause the relay to latch in, which will turn the LED off. The relay will stay latched until the ignition is turned off.

Kevin Pierson

spaspecker

Copper - Posts: 59

Joined: September 07, 2006

Location: United Kingdom

Posted: February 20, 2008 at 5:12 PM / IP Logged

blimey - that was quick!!

I'll give it a go and let you know, just to clarify when you say pin85 through a diode to the starter wire, do you mean 12v switched, or key side or starter motor side? I've already wired up the push button ignition like here so I need to make sure I get it right.

spaspecker

Copper - Posts: 59

Joined: September 07, 2006

Location: United Kingdom

Posted: February 20, 2008 at 5:14 PM / IP Logged

also forgot to ask, pin85 diode - which side is the diode stripe facing?!?

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: February 20, 2008 at 6:05 PM / IP Logged

It would go to pin 87 of your push button start relay - starter motor.

The strip of the diode would be on the relay side.

Kevin Pierson

spaspecker

Copper - Posts: 59

Joined: September 07, 2006

Location: United Kingdom

Posted: February 20, 2008 at 6:08 PM / IP Logged

many thanks, BTW - did you ever get that start/stop kit for the altima/350z sorted out? I would be VERY interested if they became available

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switch off led when engine starts

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