So I slackened off the 12mm and 14mm nuts that hold the alternator in place, put an extra few turns clockwise on the front 10mm adjuster nut to tighten the belt, tightened the mounting bolts back up and started it. Horrible droning noise, quite loud, sounded like a supercharger.
Loosened it all up, slackened the belt back off, started it up. Start to get some screeching if i put on the electrical load, but i still get the droning. So that's too loose, but I still get the droning noise.
I'm starting to think i may have done in the alternator bearings? it only ran for approx 10 seconds at the too high a tension, but I guess they are approaching 130k miles and that could easily finish them off.
Anyone done similar? I don't fancy the idea of replacing the aircon compressor (the droning persist with aircon engaged or not, so i don't think it's that).
Eurocarparts alternator is about 150quid, but its lucas branded
![Laughing :lol:](./images/smilies/icon_lol.gif)