OEM-looking Kill switch/secondary starter

[ElPants21]

Hey guys, been a while since my last post. Been working on wiring in a 3 position switch to EOC and start the engine again without needing to touch the key. There was a lot of head scratching over what to do for the kill switch part but thanks to another forum just for Hyundais, I learned Hyundai offers free shop manuals as printable pdfs on there site. WOOT! http://www.hmaservice.com/ you need to register, but it's free. Firstly, I wanted to keep it looking as clean and stock as possible. I decided to use some of the unused switch covers

I started by removing off the center council panel and chose a cover to hack up
https://lh6.googleusercontent.com/-m...114_004003.jpg

broke some stuff out of one of the covers and drilled a hole for the switch
https://lh6.googleusercontent.com/-1...114_010215.jpg
https://lh4.googleusercontent.com/-p...114_011536.jpg
https://lh5.googleusercontent.com/-S...114_011524.jpg

Then to try and make it look really slick, i found the font hyundai uses and made a stencil to paint on the switch functions
https://lh6.googleusercontent.com/-N...116_220631.jpg
https://lh3.googleusercontent.com/-q...116_222534.jpg

This guy is the engine control relay where all the fuel injectors ground. Took me a while, but i found it through an interactive electrical pdf that gives the numbers and colors of wires and lets you zoom in on specific wire harnesses with everything numbered. Anyone with a Hyundai should take note. Very comprehensive.
https://lh5.googleusercontent.com/-K...117_005742.jpg
Dont forget your heat shrink tubing
https://lh4.googleusercontent.com/-2...117_012821.jpg

Solder it all up
https://lh4.googleusercontent.com/-c...255B1%255D.jpg
That's all the pics for now. Ill finish up the assembly in the moring, but the electrical bits work perfectly on the kill switch and on the starter side as well. Bonus points for coolness?

[deejaaa]

no points yet. need to see it in action with results. and, pic of final assembly.

[ElPants21]

Sorry guys, would have pics posted of the finished setup sooner but Im working on re-stencilling the letters with masking tape instead of paper. It's WAAYYY better because it wont move around and paint wont get under it. got some derp points there. . .

[getnpsi]

I plan to do this using a rear wiper/washer switch. Those have an on and momentary. if you use one of those with a relay to energize backwards, that is super oem looking as well. Ill keep an eye on your thread and see how it goes. good work.

[ElPants21]

Sorry for the late reply, had to wait for these stupid metal clips to come in through the hyundai dealer in order for the climate knobs to work. (lost them somewhere in the dash) anyways, the project so far is a great success. I repainted the letters on the panel my switch sits in but it still looked too. . . amateurish? anyway, i sanded it of and went with the much simpler symbol approach found on most motorcycles.

Much cleaner!

and here it is installed


Here's how it's wired

Double pole double throw switch.
pin number
not used ------> 1 n.open--1 n.closed<-not used
fuel inj. ground->2 n.closed-2 n.closed<-Ignition power
fuel inj. ground->3 n.closed-3 n.open<--to starter

-Up on the switch bypasses the ignition and jumps power to the starter. The fuel injectors are grounded by default on the normally closed side as long as the keys are in (it wont start without the key, though it will crank)

-Down on the switch interrupts the normally closed common ground for the injectors and kills the engine.

(note: I think shutting the engine off in this manner may dump a lot of fuel into the cylinders. it consistently takes a few seconds longer to restart the car when it is stopped this way vs. turning the key off. The MPGuino is my next project so I aim to verify this as i currently have no instantaneous feedback. Anyone who is familiar with this or has a better way to kill the engine, please advise.)