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Thanks for the various suggestions. I did some measuring over the weekend...
Charged the new battery for 24 h in the bike - 12.47V
Got green light on Optimate for a while, then only the red "Desulphate" light. Changed to using the croc clips rather than the wired in connection, correct lights (yellow then green) every time, so the wired in connector is suspect.
In the process of doing all this, the alarm (Datatool Veto Plus) decided to play up - no beeps, no lights, bike immobilised. I followed the drain-down procedure from Datatool, now I get the red light on the dash on all the time, it beeps as if it's in Service mode, but the bike starts (and the alarm beeps while it's running).
Checked voltage on bike with engine running - 14.2 V at tickover, about 14.6 V at 3k rpm, which sounds about right.
The other thing I did was take all the wires off both battery connections and cleaned them - they were filthy!
I've now left the bike on the battery but not on the Optimate. Presumably if there's a short somewhere it'll discharge over two or three days?
I suppose the r/r could still be suspect - time to invest in one of those solid state voltmeters Shazaam recommended maybe?
Any further thoughts appreciated.
Andrew  | 
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