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Just an update guys. Changed the alternator over and fired her up and all working great. Steady 14.3v from the alternator. So that is a definite fix for that issue.

I did read that thread but making it is far harder than buying one which is what I've done. Hopefully here tomorrow

I've got stuck trying to get the fan off to make some space to remove the alternator. FSR replaced with genuine, so some progress at least

Diode in the alternator? Yeah that would make sense too. I've got the blower resistor out, it's a cheap pattern part. Will change that at the same time for a genuine part as I have heard a fan going with the ignition off before so it's probably for the best to be safe.

Well things have taken an interesting turn this morning. Went out and the battery is completely dead (5V). Bearing in mind I left nothing on yesterday then something is draining the battery with the ignition off. After a bit of research it would seem the final stage resistor is a common problem...

As long as it's only the alternator's internals governing voltage output I'll pull it out today and get it exchanged. Fingers crossed

Would you agree that there's nothing else that could be causing the over voltage?

Thanks for such a quick reply, is that internal within the alternator?

Good evening all, Apologies my first post is asking for help, but having a bit of an emergency with my 2004 RR 4.4 V8. Was driving yesterday when dash suddenly lit up like a xmas tree and car clonked into a high gear (think it was 4th) making it seem that power had been lost. Error messages...