FridgeFreezer Posted January 9, 2007 Share Posted January 9, 2007 I recently swapped my A127/65 alternator for an A127/80 (or was it A133?) anyway, it all works fine but the tacho is dead. This alt has less terminals than the old one, it used to be: Brown to main post (battery wire) Brown/orange to small bolt terminal (dash warning light) White/slate to a spade terminal on the back Black from a surpressor to another spade on the back Black from the 2nd surpressor to a spade on the white/slate wire Now I have one less spade terminal (unless I've missed something?) so connected surpressor #1 to it, and surpressor #2 to the white/slate wire. The Haynes Book Of Lies makes reference to differences but doesn't give details or the wiring of the alt I'm guessing I should lose a surpressor and connect the white/slate tacho wire to the spade terminal? Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted January 9, 2007 Share Posted January 9, 2007 Alternator tach ouput is labelled W if that's any help. fwiw, my alternator has only one surpressor, and the W is the only spade connection on the back (although the spade is bolted to a stud about the same size as the warning light stud) any help? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 9, 2007 Author Share Posted January 9, 2007 Just checked, the terminal is not marked at all and connecting the white/slate wire to it, with or without a surpressor, does not revive the tach Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted January 9, 2007 Share Posted January 9, 2007 You can add your own feed for a tach, you need to take it from one of the three windings, before the diode pack. Quote Link to comment Share on other sites More sharing options...
bernie Posted August 14, 2007 Share Posted August 14, 2007 You can add your own feed for a tach, you need to take it from one of the three windings, before the diode pack. Sorry, I wish to do this but what is a winding? Quote Link to comment Share on other sites More sharing options...
geoffbeaumont Posted August 27, 2007 Share Posted August 27, 2007 What signal do you get from the tach output? I had this problem when I tried fitting a mondeo alternator to the range rover. Modern alternators give a square wave signal, the older land rovers use a slight wave in a nominally 5V signal (IIRC). I could have lived with no tacho, but the air suspension thought the engine wasn't running and refused to play, so I had to fit the right alternator Quote Link to comment Share on other sites More sharing options...
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