It is (like many TD5's) experiencing electrical issues. Why this is so common/bad is a mystery (to me at least). If the wire inside the cable looks 'green' that is copper oxide which is a clear sign of water ingress. Unfortunately this makes the...

Agreed, definitely worth a bit more testing in that area. Just wanted a sanity check that the fault wasn’t hiding somewhere else! I might just swap out the relay anyway – try and narrow it down to the wire.

This seems to be a common thread, but so far I haven’t spotted anyone with the exact same symptoms. It all started after a genuine starter failure. Factory original as far as I can tell, so almost 20 year’s service – can’t complain! Before I go...