Wrong forum, but I'll move it once I've posted this.
I had the exact same problem when I got my Si many moons ago. I tried the starter, alternator, all sorts of things. Turned out to be the battery. Weird, but get another to try and see if that sorts it

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Quote Clarkson, Top Gear, 17th July: "I'm not having a stroke... just driving a Nissan!"
Quote Ry, Mallory Park, 3rd Dec:
"Ahhhh crap... Just a bit too over eager really!""I used to be an adventurer like you, but then I took an arrow in the knee"