car engine push button start/stop

I've been searching the forums for this, and found only 2 threads that were both locked!?! basically I'm looking at wiring in a start/stop button - a momentary button that when pushed will start the car, and then when pushed again will stop the car.

I already have a start button wired into my car like this:

30: +12v constant
87: starter motor
85: +12v ignition (switched)
86: one side of momentary switch, the other side to ground

are there any ideas as to how I can modify this to allow me to switch off the engine when the button is pressed again?

thanks in advance

You run in to issues with this, because you really need to monitor the engine or provide feedback from the system for this to be safe.  Otherwise, if you get out of sync you will engage your starter when you push the button.

There isn't an easy way to do it.  I built a system for my car, but it is based around an 8mhz custom programmed microcontroller.  It has a tach input and system feedback LEDs to let me know what the module is doing.  It is virtually impossible to crank the starter while the engine is running, even if the car is started with the normal key.

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Kevin Pierson

spaspecker wrote:

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I've been searching the forums for this, and found only 2 threads that were both locked!?! basically I'm looking at wiring in a start/stop button - a momentary button that when pushed will start the car, and then when pushed again will stop the car.

I already have a start button wired into my car like this:

30: +12v constant
87: starter motor
85: +12v ignition (switched)
86: one side of momentary switch, the other side to ground

are there any ideas as to how I can modify this to allow me to switch off the engine when the button is pressed again?

thanks in advance

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you could install a remote start like DEI that has a activation wire (to ground)... and install a push button switch that keeps the relays for the ignition and accessory on (like the radio on until door opened circuit in the relay section). you would have two buttons, but no need for a key.

You would still need the key to be able to turn the steering wheel.

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Kevin Pierson

i have a viper 5000 installed but no remote start, I understand the reply about not having a key to start, but I would prefer not to cut that out of the install. I would still need the key to undo the steering lock anyway. I appreciate the replies, I just hadn't figured on it being that complex of a job - it seemed feasible enough when I originally thought about it! I just wanted to add that extra WOW factor to the car!! I have also seen it done/fitted as an "add on" kit to the new BMW mini but I'm not sure if that kit could be fitted to another type of vehicle as the loom is already in place in that car, plus the cost of the kit from BMW would be astronomical anyway - I was looking for some sort of homebrew equivalent.

kpierson - been trying to PM you but I can't as your inbox is full?

Thanks for the heads up - I had no idea it was full.  We are limited to only 20 PMs on this site.  I cleared it though.

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Kevin Pierson

Here is a link to my project - I just updated it with my latest plans.

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Kevin Pierson

sorry mate - can't see the link??