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Mo hit one important point. You cannot loose key power when you apply start power.

If you have a second contactor installed in the pack negative wire you must have that on before you apply start power. The start input cannot be connected to the key input if you have a negative side contactor because it will not have pulled in before start input sees power.

You cannot loose power to the SLI wire at any time and after it is first powered and you need to wait a second or two before powering the start line (if the hairball sees power on start before the hairball is computer is booted it will remain off and set an error code.) With a single contactor system start can be connected to the key input (but not the SLI input because then start would have power before key.) In my buggy start and key are tied together. My Datsun was set up with a separate start wire.
 
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