Very important point to note...
After several sweary words, and a 'period of time' we discovered that the earth connection Ian refers to above is no ordinary earth connection. Having failed to find it in Jim's car to start with, I proceeded to simply earth to the chassis, but the fan wouldn't run when ignition was off. Another rummage revealed the connection, and whoosh, away the fan went.
Well.. when I say whoosh... more of a 'whhhh'. The words asthmatic and straw spring to mind
