do not usually britpart bash
but the alternator packed up on the 300tdi disco so ordered a replacement 110 quid britpart, fitted and found that there's no output on the W terminal for the rev counter, the output voltage is within spec but on the high side being 15volts constant instead of the 14.3v max found on LR products. Have been using a borrowed genuine alternator and that works fine and drive the rev counter so confident its a fault of the new alternator. On the defender I wouldn't care less or even have known there was a problem (no rev counter).
So got to live through the hassle of returning etc hopefully l.r.series.com will be a hassle free experience.
good news : now expert at swapping out the alternator on a 300tdi disco in under 20minutes