One of my front sidelights( inside the headlamp unit) failed. The bulb was ok. The problem was a corroded bullet connector. It was solid and couldn't be pulled apart.The wiring under the wing is quite exposed so no wonder it corroded. I cut the bullet connectors off and replaced them with spade ones and used shrink wrap to seal them. It was the nearside one so even more spraying from puddles that gather on the road side.
Bullet are fine when not exposed to the elements but surely waterproof connectors should be in the under wing area. The area gets a real dowsing from the wheels. The offside was in better condition so left for a while until I get round to replacement.
I sorted a rear fog problem last year that was caused by a multiplug coming apart ( behind the dash). No locktabs so a small cable tie was used to hold it together. The control module was also rattling. I had to open it and reglue the pcb inside back.
The trouble with Morgans is the random ( seems like that) changes to wiring that are hard to get info for. Gomog has some wiring diagrams but wire colours seem to change!