Yeah the diodes and regulator went in the first place, but that just stopped it working, no warning light - then got a re-conditioned unit, worked for a day then it went as well because of faulty parts, but still no warning light, it's only the latest one that has caused the ECU warning light.. Electrically everything is fine with the charging outputs.. Did your ECU light come on? What car do you have?
Cheers for your reply by the way, thought it was falling on deaf ears!