The chipped key certainly complicates things.
For older cars with a plain old dumb key, it's generally easy. First of all find the wiring diagrams for your car. Most cars you should be able to get a hold of the factory service manuals. Next, if you dig into the steering column deep enough you'll find the connector that goes to the ignition switch. Some are at the physical key, some are further down the column and the key actuates the switch via a lever/rod. Pull the connector off. In just about all cases there is a main power in, and then various outs that get connected depending on what position the switch is in.
Once you know what wire does what, You're going to recreate a simplified version of the ignition swtich. Group the output wires into two branches. First branch is all the outputs that need power when the car is on. The second is simply the starter signal wire. First group, either find a switch that is rated for high current and run the power in and grouped out through it, or get a lighter duty switch and a relay. Then take a branch off the power in and add to a push button that connects to the starer signal wire. When all is said and done to start the car you flip the first switch to on, and then press the starter button until the engine starts.
1. Normally when you turn a car to start it kills power to a bunch of the normal outputs because the starter will put so much strain on the battery. The above eliminates that. If you're worried you can fix it a couple ways.
A) split the ignition wires into two switches. One would be the small group that retains power when the starter is cranking, and the second would be the rest. Flip the switch for the essentials during start, press starter button, then flip the second once the car starts.
B) Keep the single switch, but run the items that turn off during cranking through a relay. You'll need to wire it so that it's in the normally closed position. Then use the starter circuit as the relay signal. Basically power will go to those items normally, but when you press the starter button it will cause the relay to break the circuit and turn them off. Then once you release the button it turns them back on.
2. As you mess with the ignition, make sure your kill switch still shuts everything off as it's supposed to.
3. If you're like me electrical systems will take you a couple tries to make sure you haven't screwed it up. Read the diagrams carefully.
For chipped cars you can largely do the same as the above, provided that you keep the security chip circuit intact. Locate the antenna, tape the key near it, and make sure it still receives power and outputs the same way to the rest of the car.
Removing the steering lock depends on the car. Some are really easy, and some just plain suck. Basic answer is you need to figure out how the ignition switch is removed and pull it apart enough to remove or otherwise break the pin.
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