Rotax100uk Posted January 10, 2011 Share Posted January 10, 2011 Hello all i have been having some bad experience with fitting new alternator to defender 90 (1989) with a 200tdi out a a discovery, basically what im getting is when i connect upto D+ for the 12v from battery and B+ for the 12v to dash battery light im getting too high voltage to the battery and dash light as in around 30v, you can smell the new battery frying!! so after research on the net i moved the battery 12v onto the W terminal and just took of the B+ to the dash light and its charging nicely at 16~17v to the battery but the on terminal D+ and B+ im getting 33v although nothing is connected to them. then when you turn the ign off the battery just discharges itself over night, i have been checking earths and done a ohms test and im getting ohms reading from alt to body, body to batt etc etc, has anyone got any advice as im really struggling with this now and need the vechicle running, is it just a dud alternator or battery?? they were both brand new when fitted last week, alternator which was taken off was the same but i never checked it out too much just replaced it when it was suspect to be faulty. any help would be great. Quote Link to comment Share on other sites More sharing options...
tweetyduck Posted January 10, 2011 Share Posted January 10, 2011 From a post by forum member Western Lucas ind = warning light + = main output to battery/starter S = battery sense [not on all alternators] Other alternators D+,61,L,lamp,N = warning light B,B+,Bat,30 = main output to battery/starter S = battery Isn't W the tachograph output....so you won;t be using that........ Quote Link to comment Share on other sites More sharing options...
western Posted January 10, 2011 Share Posted January 10, 2011 W = tacho/rev counter signal connection, Don't connect if there is NO rev counter fitted. the reply above is taken from this diagram Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted January 10, 2011 Share Posted January 10, 2011 has anyone got any advice as im really struggling with this now and need the vechicle running, is it just a dud alternator or battery?? The alternator was probably fine until you wired it up incorrectly. Hopefully when you wire it correctly, you'll be ok, but if anything's got smelly, don't be too surprised if parts are now damaged. Quote Link to comment Share on other sites More sharing options...
tweetyduck Posted January 10, 2011 Share Posted January 10, 2011 there are some places on ebay that do diode packs for many alternators if you've fried it though so all might not be lost. Quote Link to comment Share on other sites More sharing options...
gaz489 Posted January 11, 2011 Share Posted January 11, 2011 i had this problem with mine it was a faulty part in the alternator which was brand new it had failed and was putting 25v through then when the ignition was off overnight it ran the batteries flat. Quote Link to comment Share on other sites More sharing options...
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