The Morris again. Just to recap, 1968, now -ve earth but still dynamo,
control box etc.

Suddenly started to flatten the battery whilst parked, but charges when
running. Restarting a couple of hours after a good run, no problem. 24
hours after a run, battery sluggish but will just about turn over
engine. 48 hours after a good run, starting by handle only.

I have convinced myself the problem is the Lucas control box, which is
almost certainly original. This is a Minor, so there is nothing to be
left on when the car is not running, other than lights, which I have
checked, ditto interior light. About the only other electrical
accessories are indicators, wipers and simple on/off heater blower, but
they are wired through the ignition. No radio, heated rear screen or
anything like that.

Given that control boxes are around twenty quid, I'm tempted to just
replace the old one and see if that fixes the problem, but have I missed
anything obvious?

--
Graeme