Gpro Posted October 6, 2016 Share Posted October 6, 2016 (edited) Ok guys, I'm about to pull my hair out My alternator has stopped charging when the car warms up. When cold it would charge, but when it warms up and I put my foot down a bit, it would stop charging. I bought a new alternator from ebay and it was fine for the first drive, about 1 hour. The next day I took the car out again, it was charging fine but then noticed it would over charge after 2800 rpm. It would spike to 18v and my headlights would become a lot brighter! I got another alternator, again it worked fine for the first 30 mins or so, but when car warmed up it stopped working. Today, the alternator won't charge at all, regardless if it's cold or not. Does anyone have any suggestions? FYI I have used 3 different batteries, including a brand new one. So battery isn't the issue. Additionally, I blew an 30amp EFI fuse recently, now replaced. Not sure if that has had anything to do with it. Edited October 6, 2016 by Gpro (see edit history) Quote Link to comment Share on other sites More sharing options...
peter richards Posted October 6, 2016 Share Posted October 6, 2016 mine went a year or so ago , and the first one i had fitted lasted a day , the second one ok .so you never know it could be a dud Quote Link to comment Share on other sites More sharing options...
keron Posted October 6, 2016 Share Posted October 6, 2016 Check the crank pulley too. Do the tipex mark and see. If the belts slipping that could be a reason... Quote Link to comment Share on other sites More sharing options...
absz Posted October 6, 2016 Share Posted October 6, 2016 If its over charging then the Regulator is faulty within the alternator, loose connections or voltage spike can cause the alternator to go bad make sure the earth cables and main battery cable to alternator are good best way of doing this is by a Multi-meter resistance check (voltage drop test) Quote Link to comment Share on other sites More sharing options...
Gpro Posted October 6, 2016 Author Share Posted October 6, 2016 Thanks guys, I have a spare fan belt, so will change it just in case and will do a resistance check on the weekend. Quote Link to comment Share on other sites More sharing options...
Mad Hatter Posted October 11, 2016 Share Posted October 11, 2016 These guys build replacement units with a donor process £150 plus your old one (I think there was a £50 deposit they hold) http://www.universal-rotating.co.uk/Public/Default.aspx mine died 2 years ago and their replacement has been very good so far - easy to replace too with the air filter out of the way Quote Link to comment Share on other sites More sharing options...
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