Do something for me.

Go outside, start the bike then turn it off (on the handlebar power switch), remove the card and leave it for 10 minutes.

Now flick the power switch without the card in place.

Nothing should happen.

I've said 10 minutes but that's huge, on my racebike (with the HRC loom) it's about 15 seconds you have to leave it for before the screen doesn't come on and it won't start.

I still think you've spliced one wire too many, on my roadbike removing the card still used to kill it, even with the splice done.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread