My battery charger seems to be faulty - cutting out as soon as it is
plugged in, with a flash coming regularly every couple of seconds
(from a fuse-like bulb located on top of the coil (cover off)).
It's a good enough charger when it's working, with boost/fast start as
well as trickle; it also has an automatic cut-out to prevent
over-charging. With the cover off, there does not seem to be any
obvious short.
Any ideas?