Rectifier or Alternator? Help!

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Battery isn't recharging. Battery is only 3 months old. Headlight dims slightly when bike is revved (surely it should go brighter when revved). Is this likely to be the alternator or the rectifier?

[tony.mon]

Oh, yes.
Definitely one of those two, or the wiring coming from/going to them.

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But which one?

[tony.mon]

Impossible to say, until you meter them out or replace one or t'other.

Suggest you disconnect the connectors from both, then see if it's any better; reconnect one at a time to see if you can isolate the fault.

If it's the rr, it could have killed the battery, too- they don't like 40 volts up 'em.....

have a look in the workshop section, as several people have had probs with these lately, and ealrn for their experience.

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Thanks for that