nickjaxe Posted June 6, 2009 Share Posted June 6, 2009 I was checking the voltage the alt was putting out tonight on a disco 200 tdi engine 5 mins after start-up it was still putting out 17.4volts at the battery idle or reving which sounds high to me what do you guys think. Nick. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 6, 2009 Share Posted June 6, 2009 that will almost certainly kill your battery in no time. You want 13.8-14.4v with it ideally at 14.1 or so. anything over 14.4 causes the battery to start gassing, with 17.4v it could explode and will most definately kill it if you run it like that for any length of time. Quote Link to comment Share on other sites More sharing options...
western Posted June 6, 2009 Share Posted June 6, 2009 as above, alt needs checking over, possibly a duff rectifier pack causing the over volts. your battery isn't very happy with that 17v being shoved in it. Quote Link to comment Share on other sites More sharing options...
K88 MUD Posted June 7, 2009 Share Posted June 7, 2009 Im sure if the alt was putting 17+ volts out most of your bulbs etc would pop.....including your battery. Test your tester or try another before its too late. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted June 7, 2009 Share Posted June 7, 2009 With 17-volts, the battery will be over charging, which will make it get hot and boil the acid. The gas given off is hydrogen, which is highly explosive. The battery can also burst - especially if it's the sealed, non-vented type. If your battery is hot, swollen, venting what looks like steam, then you must leave it to cool down completely before going anywhere near it. You will need a new battery and replace/repair the alternator. Maximum output from the alternator should be around 14.6 volts. Les. Quote Link to comment Share on other sites More sharing options...
nickjaxe Posted June 7, 2009 Author Share Posted June 7, 2009 I will check my tester I think, just tried it on my S3d and just after start-up thats showing 16.4v, Maybe worth getting a new one under £6 at aldi at the moment. Nick. Quote Link to comment Share on other sites More sharing options...
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