JimAttrill Posted October 19, 2009 Share Posted October 19, 2009 I have a 1995 300Tdi, and for a few years have carried a spare 65A A127 alternator, one in which I changed the bearings. About 6 weeks ago I had to use the spare as my batteries were run completely flat - down to 10v or so - over a weekend. I fitted the spare and it seemed to do well - charging at 13.5v etc. Then one day quite a long way from home the charge light came on fully and the rev-counter went to zero. It would flicker occasionally and the rev counter would also flick its needle. But being a Tdi I managed to get home without the battery going below 11.5v as it was during the day. I went to buy a new alternator and managed to find a Disco 100A Denso/Marelli alternator, at quite a high price. I fitted it expecting everything to be hunky dory but on starting the engine the light was flickering. At 2000 rpm the light mostly goes out. The battery is being charged at 13.9v to 14v when I last checked. Is there anything that I should be doing apart from taking it to an auto electrician? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 19, 2009 Share Posted October 19, 2009 Look for chafed or burnt wires would be first stop. Clips, grommets (or lack of) and near hot or rotating parts are favourites for wiring damage, often very hard to see if it's in a loom. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted October 19, 2009 Share Posted October 19, 2009 Bad urf? Quote Link to comment Share on other sites More sharing options...
mmgemini Posted October 20, 2009 Share Posted October 20, 2009 Fried wiring Quote Link to comment Share on other sites More sharing options...
errol209 Posted October 21, 2009 Share Posted October 21, 2009 Bad urf? Fried wiring No, I don't think eggs. fried or otherwise, are the problem but I'd go with a bad earth strap I'm wondering how big yer pulley is, as the problem goes away at higher revs. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 21, 2009 Share Posted October 21, 2009 I'm wondering how big yer pulley is, as the problem goes away at higher revs. In the event there's a short circuit which takes higher output from the alt to overcome, I don't think dumping more electricity through it is the best plan... although it would probably find the fault quicker, just follow the smoke Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted October 21, 2009 Author Share Posted October 21, 2009 I think you lot know about as much about electrickery as I do. So I will take the thing to the auto-electrician that I have always sent other LR owners to. There aren't many good ones but there is one locally who does know what he is about and he almost specialises in Land Rovers. He also fixed my Audi a zillion years ago. (I still have it and use it every day - a 1987 SE auto) Quote Link to comment Share on other sites More sharing options...
mmgemini Posted October 21, 2009 Share Posted October 21, 2009 I think you lot know about as much about electrickery as I do. So I will take the thing to the auto-electrician that I have always sent other LR owners to. There aren't many good ones but there is one locally who does know what he is about and he almost specialises in Land Rovers. He also fixed my Audi a zillion years ago. (I still have it and use it every day - a 1987 SE auto) Really. I do know that the wiring for the 65amp alternator is NOT capable of doing the job with a 100 amp alternator. Quote Link to comment Share on other sites More sharing options...
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