Yes, that's what I meant, it won't break it but it generally only tends to show up then - breaking down mid journey is very very very very (get the pictureindigolemon wrote:Also, short journeys won't break the main relay - but if it's already broken they will make the problem obvious!

I guess the difference is on a long journey, the relay heats up, the joint gradually opens up and the resistance goes up but you need less current to maintain the relay in a closed state than to pull it in in the first place, so it stays in place. When you switch it off though, the joint remains partially open (high resistance) and doesn't pass enough current to bring the relay in (until it's cooled down again and resistance has dropped).