Thanks Roger,
I have added the splice and connector to the list of things to check/wiggle while monitoring the OHMs.
New Multimeter probes arriving today.

BTW, how best to fix a splice? should it be soldered or would a block type connector be ok? My soldering skills are poor to fair (my tools must be to blame) and I don't fancy going near all the wiring in the fuse box with anything hot.
Regards