the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

switch off led when engine starts


Post ReplyPost New Topic
< Prev Topic Next Topic >
spaspecker 
Copper - Posts: 59
Copper spacespace
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
Platinum spaceThis member consistently provides reliable informationspace
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
Copper spacespace
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
Copper spacespace
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
Platinum spaceThis member consistently provides reliable informationspace
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
Copper spacespace
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

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Thursday, October 31, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer