2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Igntion switch/key bypass

Old Mar 16, 2013 | 01:36 PM
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Igntion switch/key bypass

I am looking to remove my ignition cylinder and go with a toggle switch system with push button start. I searched and found one thread where somebody wanted to do it. satch described the process:

Originally Posted by satch
The switch works as follows. Turn the key to ACC and voltage from the Black wire of the Front harness passes onto the Blue ACC wire. Turn the key to on and the voltage from the Black wire passes onto the B/W wire and the B/R wire in the plug w/the Blue wire and the B/W wire and the B/R wire powers the ignition fuses ( both IG1 and IG2 fuses). Turn the key to start and the voltage from the B wire passes onto the single B/R wire which powers the start circuit. So you'll need a series of toggles. You really can't join a group of these wires together because there isn't enough voltage when starting to power everything. In a normal situation, power is cut to the ACC and IG2 fuses/accessories such that only the IG1 fuses and the starter circuit is supplied power to start the car. So you'll likely need at least three toggles if not four, but it depends on how you want your system to work. Do you want the ACC fuses powered seperately from the fuses powered w/key to on or powered at the same time.
What I got out of that was this:

Key to ACC: 12v from B goes to Blue ACC wire
Key to RUN: 12v from B goes to B/W, B/R and Blue ACC
Key to START: 12v is cut from B to ACC and IG2(B/R) and 12v applied to single B/R wire (starting circuit)
Key back to RUN: 12v restored to ACC and IG2 and removed from single B/R

So to properly do this I would need 4 toggles plus my start button.

FUEL switch (just to turn fuel pump on/off)
ACC switch to toggle Blue ACC wire
IGN1 switch to toggle B/W(IGN1)
IGN2 switch to toggle B/R(IGN2)

And so to start the car, I would need to turn on IGN1 and quickly flip on ACC and IGN2? Or if I wired the start button to a relay and just used the starting circuit wire as a signal, would there be enough power in the system to just have all switches on while starting? I ran all new wiring from the battery to starter and replaced all my grounds, so I'm in good shape there.

Just looking for some advice.
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Old Mar 16, 2013 | 01:59 PM
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From: tulsa,ok.
Since voltage is cut to ACC and IG2 during start, both should be able to be left in the open position when starting the car. IG1 circuit powers the fuel system so there would be no need for a fuel toggle.
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Old Mar 16, 2013 | 02:07 PM
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Originally Posted by satch
Since voltage is cut to ACC and IG2 during start, both should be able to be left in the open position when starting the car. IG1 circuit powers the fuel system so there would be no need for a fuel toggle.
I wasn't sure if the two circuits being cut was done by the switch itself or if it's something I would have to account for. Thanks.
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Old Mar 16, 2013 | 02:48 PM
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From: tulsa,ok.
Originally Posted by Hazard15301
I wasn't sure if the two circuits being cut was done by the switch itself or if it's something I would have to account for. Thanks.
You're correct about the switch being responsible and it was something I overlooked!
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Old Mar 20, 2013 | 03:56 PM
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Last thing...

The push start kit I have has horrible directions....

I get what it's trying to tell me, but part of it isn't making sense.
There is a push button, which has it's own pigtail that plugs into the relay box. Then, coming out of the relay are 4 wires: Red, Black, and 2 blues.

From what I gather from the instructions, Black to ground (obviously), red to main power coming into the ignition (which I found to be a white\red wire btw). I think its then supposed to be one of the blues to the W\R and the other blue to the starter wire (B\R)

Sound right?
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Old Mar 20, 2013 | 07:49 PM
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Nevermind, I figured it out.





I'll go with a lower profile toggle switch for the final version, to avoid accidental bumps.
Attached Thumbnails Igntion switch/key bypass-img_20130320_183744.jpg   Igntion switch/key bypass-img_20130320_184325.jpg  
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Old Mar 20, 2013 | 08:00 PM
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That looks nice (except for the toggles, which I agree need changing) but I have to wonder what the point is.
Why is this better than the standard ignition switch/key?
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Old Mar 20, 2013 | 09:08 PM
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Because the car has made it's switch from DD to just for fun, and it's something I wanted to do. No benefits, other than I like the way it looks and the functions of it. I wanted to do a push button with an RF system, but that's a little out of my budget atm.
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Old Mar 20, 2013 | 09:46 PM
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That would look awesome in carbon fiber with small light up switches
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Old Mar 20, 2013 | 11:56 PM
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Hmm.instead of toggles,what about Lighted Push button type "switches"?.
It would match in with the Big "GO " button!!!
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Old Mar 21, 2013 | 12:23 AM
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Like these.
The vandal resistant series are what you want.
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