Some sites don’t allow connectors (C&MC). Also the connectors clip together to maintain the electrical integrity and should not pull apart.Now I'm wondering whether, if I didn't have the alarm, it would be worth having a short (2ft?) extension lead between my van and the main cable. Perhaps a well-lubricated one.
I have visions of sockets being wrenched out of van panelwork and visits to bodyshops afterwards. For those who have forgotten to disconnect (and I admit to having come very close myself), was it a highly destructive process, or did something cheap give way before too much damage was done?