I had a battery disconnect switch in on my 1972 Morgan. Unfortunately the removable key worked loose a couple of times at speed so I disconnected it permanently. Perhaps a Lucas style switch would be more robust.
I had similar - must have been a bad year! The internals on mine had gone dodgy.
Initially bypassed and then removed it, and now have one of those 'unscrew' types on the negative battery terminal, but to honest, only use it when doing wiring or welding.
