Belated thank you for the detailed response. Only now had a chance to investigate, due to work commitments. There were a couple of good tips in there which got me looking differently at the problem. I was able to rule out a fault with the indicator/dip switch and tried disconnecting some additional wiring installed by a previous owner, one of which cured the problem. This raises the question as to why this modification was installed in the first place and doesn't give me 100% confidence this is the end of the matter.
|