Re: 156 Electrics possessed by Satan
THE SOLUTION TO POSSESSION!
The fuses that are attached to the battery itself are split into two connector blocks. I took it all to bits and found one of them was loose, connecting sometimes and not others, leading to the intermittant fault. It's impossible to see unless you take it all to bits completely. There was some evidence of sparking across the base of the fuses but they weren't blown. A good clean, bit of WD40, and a quick tweak to make sure they stayed in place and hey presto, exorcism performed, no more electrical gremlins at all. It's been sound for a few months now. Hope this helps someone. I'm sure there's plenty of other problems waiting for me but this worked for my particular circumstances. Most happy.