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[andyc]

Mine was over charging the other week, no battery light but very other light was on and had the trans warning as well.

Alternator was pumping out somthing like 18v

Andy

[x1xv45]

New alternator (£20 scrapyard item) readings (from cheap multimeter):
a.12.7
b.14.3
c.14.1
d.14.1

Now there's no more warning light, and no check automatic gearbox warning. Phil - didn't get to check the old alternator with sensor wire on again as I didn't see your post till now - if you're right, then not sure if the warning light was the result of real lack of charging or some electronics failure inside the alternator to do with the sensor.
Mark - "There is a tensioner that simply requires a spanner on the front nut". I looked but all I see is brackets (?) I undid the bracket above the alternator, slacked the bolt at the bottom and pushed the alternator to the right, and that gave enough leeway to get the belt off. Many thanks to everyone!

[hotel21]

[movedhere] Omega General Help [move by] hotel21.

[philhoward]

Those readings sound about right given a little leeway for a cheap meter...£20 well spent, i reckon.

As for the tensioner, the idler pulley has a bolt head in the middle.  Put a spanner/socket on it and you'll find it moves round on its spring to relieve the tension on the belt...

[x1xv45]

"tensioner", "idler pulley" - now I get it - I did mess with it at first but didn't get anywhere - next time I'll just turn on the bolt and save a bit of time, thanks. Anyway, good result for chickenfeed (another high-tech term) - I have my car back!