Pulley seems intact and the black wire was attached to the positive stud in the fuse box, so I removed it...maybe what remains of an old alarm?
Checked the battery again and it was charging this time, over 13V ...so maybe it was a bad connection before.
But when I took it out I noticed the master warning light and rear tail fault light would flicker, when at lower speeds mainly, 40 and below iirc.
Thinking about the rear lights, I did swap out my uk spec to a jdm set and the rear tail fault light does come on during ignition, could that be the issue? Fuse is fine and all rear lights work.
Can a disabled active spoiler (via button on dash) cause any issues?
It drives fine but I'm quite jumpy after having it break down and when I saw the lights flicker I was panicking in case it breaks down again